Copper oxide and damp concrete. The smell reached Vela before she opened her eyes, threading through the fug of sleep like an old unwelcome guest. She had learned to read safehouses by their odors, and this one carried the particular perfume of the foundry district: mineral tang, machine oil gone rancid, the ghost of yesterday's rain trapped in pipes that hadn't drained since the Quake.
She lay still, cataloging. Mattress beneath her, thin as a folded prayer. The taste of copper where her tongue pressed against her teeth. A ceiling somewhere above, close enough that she could feel the weight of it, hear the faint complaint of stressed metal when she shifted. Her right temple ached. That was new. That was the port.
She raised her hand and found the patch without looking. Fingers brushed the neat ridge of adhesive, the cooler disc of black-market hardware seated just behind her ear where the lattice nodes of a Frequency Authority implant should have rested. The tech she carried now was smuggled, unlicensed, and worth more than the safehouse, Tariq had said. Worth more than she was, probably, if you priced things by the rules of the outer markets.
Vela swung her legs over the edge of the cot. The floor was gritty. Cold crept through the thin soles of the socks Tariq had given her, and she curled her toes against it, feeling the texture of the concrete like braille.
"Vela." Tariq's voice reached her before he appeared, a low steady signal that she tracked by direction. He came through the low doorway, stooping because the lintel would not accommodate his height. He carried two cups, one in each hand, steam curling from both. "You slept four hours. I was about to wake you."
"Four hours is generous." She took the cup he offered. It warmed her fingers before it warmed her anywhere else. Inside, something that smelled like roasted grain and chicory. Not good, but hot, and that mattered more. "How long has it been since we crossed the cordon?"
"Eighteen hours." He settled into the chair opposite, the one that creaked on a bent axle whenever he leaned back. "Your port needed the night to calibrate. You would have felt everything unfiltered, otherwise. Every signal in this district, every whisper."
She remembered pieces of the crossing, sharp and bright as shattered glass. The bottleneck at the perimeter. The dead-zone drift that ate the Authority's eyes. Tariq's hand on her elbow when her knees had gone sideways. The smell of her own fear, sour and too human. Then nothing. Then here.
"The Seven." Her voice came out smaller than she wanted. "Did we lose them?"
Tariq did not answer immediately. He took a sip from his cup, watching her over the rim. When he spoke, his inflection had flattened, which she had learned meant he was choosing his words with care.
"The lattice read your port while you slept. I pulled what I could from the buffered capture before it degraded. Your implant, the original one, recorded your last contact with the harmonic, and the smuggled port kept the resonance profile when the Authority tried to scrub it. There was a pattern embedded in the broadcast. I broke the first layer of the cipher, then I ran it through the cartography program I have been refining for two years." A pause. The chair complained under him. "It is not just a sound, Vela. It is a map."
She set her cup down. The ceramic clicked against the concrete floor.
"Show me."
Tariq reached into the satchel that hung from the chair's back and produced a battered slate. The screen glowed in the dim space, painting his face in pale blue. He turned it toward her, and she saw lines drawn on lines, concentric and precise, like ripples frozen in a pond.
"The message repeats," he said. "Every forty-seven seconds, the harmonic cycles back through the same sequence. Inside the sequence, there is a coordinate pair and a single word. The coordinate resolves to a location outside the Authority's chartered grid. No roads go there. No relay towers. The cartography program identifies it as a region that was redacted from the public surveys after the Quake. Whoever drew the official maps decided no one should be able to find it again."
"And the word?"
He tapped the slate. A string of characters resolved at the center of the map, simple and stark.
REMEMBER.
Vela stared at the word. It pulsed gently on the screen, a heartbeat rendered in font. Her throat tightened. The word was a strange and tender thing to find buried in a signal that had once been used to herd her family into silence.
"Where is this place?" she asked, her voice catching on the question.
Tariq enlarged the map with a thumb-swipe. The coordinate pair hovered over a topographic rendering of ridges and gullies. The terrain looked like the skin of something ancient and scarred.
"Northern perimeter. Beyond the Hollow, past the quarantine checkpoints. Somewhere in the badlands where the relay network never reached. There is a name that appears on some of the older survey papers, but it has been inked out so many times the paper is more black than white now."
"Say the name anyway."
He hesitated. Then: "Cairn."
The word landed in the space between them with the weight of a held breath. Vela thought of her sister, Eira, of the recordings she kept on a battered drive in the bottom of her pack, of a voice that said her name like it was something precious. Eira had used to mark trails when they were children. She would pile stones at the forks so they could find their way back. Cairn. A marker. A sign that someone had passed this way.
"My sister used to make cairns," Vela said, not meaning to speak aloud. "When we walked the boundary of the Marsden claim. So we could always find our way home."
Tariq's expression softened. The lines around his eyes shifted, gentling. He did not try to fill the silence with comfort, which was one of the reasons she trusted him. He understood that some griefs needed room.
"There is more," he said after a moment. "The word REMEMBER does not appear once. It appears at intervals, layered between the coordinate pulse and a sequence of tones I have not been able to decode yet. Whatever the Seven are broadcasting, they are not just sending a location. They are sending an instruction."
"Remember what?"
"That," he said, "is what I cannot tell you from a slate. I can tell you the signal is old. The encoding matches the harmonic signature of the Seven's original transmissions, but the cipher is different. Someone taught them a new language. Or they taught themselves."
Vela stood. The room swam briefly, her inner ear catching up with the motion, and she steadied herself against the wall. The concrete was rough under her palm. Cool. Real. She let it anchor her.
"Play it," she said.
Tariq's mouth thinned. "Your port has only had four hours to settle. If the unfiltered signal hits before the calibration completes, you could lose more than hearing."
"I have already lost more than hearing." She turned to face him. "Play it."
He held her gaze for a long moment, measuring something. Then he reached into the satchel again and withdrew a small device, matte black, no larger than his palm. The playback module. He set it on the floor between them, the way you might place a weapon on a table, carefully, with respect for what it could do.
"You will need to open the port," he said. "The adhesive has a tab on the upper edge. Pull it toward your hairline, slow, so you do not tear the contact."
She raised her hand again. Found the tab. Drew it down. The seal parted with a small, intimate sound, like the peel of a fruit. The cool air touched the metal disc behind her ear, and a rush of sensation followed, the world suddenly textured with frequencies she had spent her life learning to name.
Tariq's heart. The mains hum beneath the floor. The distant complaint of an overworked transformer two streets away. A fly, buzzing somewhere she could not see. The entire district, alive with signals, pressing at the edges of her perception.
"Ready," she whispered.
He pressed play.
The harmonic poured into the room, and Vela fell into it.
It was not a sound, not exactly. It was architecture. It rose around her in great curving walls, a cathedral built of resonance, each stone a frequency, each joint a silence that meant something. She knew this place. She had been here before, in the moments before her family vanished, in the last clear days of the world she had been born into. The Seven had sung her here once, and she had walked these corridors in her mind, and her sister had held her hand.
The coordinate pulse came first, a bright repeated chime that marked the rhythm of the map. Then the tones, rising and falling in patterns that shifted and folded like the wings of something in flight. Then the word, spoken not in any human voice but rendered in the harmonic itself, a glyph of pure intention that her mind translated without effort.
REMEMBER.
REMEMBER.
REMEMBER.
And beneath the word, woven through the signal so finely she almost missed it, there was a thread of something else. Not the Seven's chorus, not the Authority's sterile lattice. Something singular. A voice. Familiar in a way that made her chest ache.
She opened her eyes. Tariq was watching her, very still, the slate forgotten in his hand. The playback had ended. The room was just a room again, with its concrete and its damp and its particular small griefs.
"Vela." He spoke quietly. "What did you hear?"
She realized she had been crying. She touched her cheek and found it wet. The tears were warm against her fingers, and she did not remember starting to weep.
"Solen," she said. The name felt strange in her mouth, like a word in a language she had only read, never spoken. "Solen Kade. He is alive. He is at the coordinate. And the Seven are with him."
Tariq set the slate down slowly. The chair creaked beneath him, a small mechanical confession.
"The broadcast that killed your family," he said. "The one that the Authority blamed on the harmonic instability. You are telling me the person who triggered it is the one asking us to remember."
"Yes."
"And you want to go to him."
It was not a question. Vela wiped her face with the heel of her hand. The smuggled port hummed faintly against her skin, settling back into its calibration.
"I have to," she said. "He is the only one who can tell me what the Seven wanted. He is the only one who can tell me why they chose me. And he is the only one who can tell me what happened to Eira."
The name of her sister hung in the damp air of the safehouse. Somewhere above them, beyond the low ceiling, the foundry district went about its battered business. Metal cooled in molds. Conveyors ground their endless loops. Somewhere, a child might be listening to the static between stations and hearing, in its hiss, the shape of a door.
Vela picked up her cup. The chicory had gone cold. She drank it anyway, because thirst was thirst and the body did not negotiate.
"When do we leave?" she asked.
Tariq looked at the slate, at the map with its pulsing coordinate, at the single word that would not stop repeating in his mind.
"As soon as Pip arrives," he said. "We will need an extra pair of ears for the crossing."
Pip arrived before the dawn shift changed over, slipping into the safehouse through a vent cover that Tariq had spent three weeks converting into a proper door. The child moved with the particular economy of someone who had learned to make himself small in a world that punished largeness. He was ten, perhaps eleven, though hunger had a way of blurring the calendar. His hair was the pale brown of foundry soot that had been washed one too many times, and his eyes held the brightness of a signal amplified past its safe threshold.
"You were talking about me," he said, from the threshold.
Vela turned on her stool. The slate lay face-down on the table, a private thing, and she did not flip it over.
"We were waiting for you," she said.
"I heard you. From the alley. The harmonics go through the bricks here." Pip closed the vent cover behind him and latched it with a click that sounded older than he was. "I can hear Tariq's transmitter even when it isn't on. It hums. Everything hums."
Tariq watched the boy cross the room. There was a careful way Pip moved around objects, as though he were negotiating with them, asking permission. He set his pack down by the door, unwrapped a length of wire from around his wrist, and coiled it neatly on the bench.
"Coordinate's locked," he said. "I can feel it. It's like a tooth that hasn't come through yet."
Vela exchanged a glance with Tariq. The older man gave a small nod, permission, and Vela slid the slate across the table. Pip studied it the way some children studied beetles, turning it slowly, one finger tracing the air above the pulsing mark.
"That's old ground," Pip said. "Older than the foundry. Older than the canals. There's a name for it but it isn't on the slate."
"What name?"
Pip looked up. His mouth worked for a moment, as though he were tasting something.
"Cairn," he said. "I've heard the relief operators say it when they think nobody's listening. They say it the way you say a swear."
Vela's fingers found the edge of the slate. She did not lift it.
"Cairn," she said, quietly. "I have heard that word before."
Tariq set down his cup. The safehouse had a way of absorbing small sounds and returning them larger, and the click of ceramic on wood seemed to echo longer than it should.
"Where did you hear it?" he asked.
Vela did not answer at once. She was thinking of Eira, of course. She was always thinking of Eira. But the memory that surfaced was not the death, not the broadcast, not the fire. It was a small thing, an almost nothing. A map in a schoolbook, before the Authority rewrote the schoolbooks. Eira had traced a district at the edge of the page with her fingernail, and Vela had asked what it was, and Eira had said, a place where the dead are remembered, and then the lesson had moved on, and Vela had not thought of it again for thirty years.
"I will tell you on the way," Vela said. "If we are going, we go now. The dawn sweep will pass over the southern causeway in forty minutes. After that, the corridors tighten."
Tariq rose. He had a way of standing that reminded Vela of broadcast towers, a certain vertical patience, as though he had spent his life bracing against weather.
"We will need cover identities," he said. "The relief route out of the foundry is watched at the second junction. I can get us past with a maintenance manifest, but only if there are three of us. They expect a crew."
"I can be the third," Pip said, eagerly. "I know how to be small. I can carry tools."
"You can carry this," Tariq said, and he pressed a coil of wire and a small tuning fork into the boy's hands. "And you can listen. If the harmonics shift, you tell us. You do not tell anyone else. You do not even tell us out loud if you can help it. A nod. A look. A hand on the wall."
Pip nodded, solemn.
They moved through the safehouse with the quick, practiced quietness of people who had rehearsed departure. Tariq locked his transmitter behind a false panel of brick. Vela pocketed the slate, the port warm against her hip, the coordinate pulsing faintly in time with her stride. Pip shouldered his pack and took his place between them, the tuning fork in his palm, his head tilted as though listening to a sermon only he could hear.
The vent cover closed behind them with a small sigh.
The foundry district at dawn was a country of held breath. Conveyors ground their endless loops. Cranes swung in slow arcs over rooftops that wept condensation. The relief operators were beginning their rounds, moving in pairs along the elevated walkways, their lanterns cutting pale columns through the vapor. Vela had walked these streets since she was a girl who could not yet hear the Seven, and she had learned their grammar: where the footing was sure, where the grates gave, where the sound of a footstep would carry and where it would die.
They passed a relief station. Tariq produced a manifest from his coat, a folded square of treated paper that smelled of machine oil and printer's ink. The operator on duty scanned it, scanned them, and waved them on with the bored gesture of a man who had stopped seeing faces years ago. Pip kept his head down. Vela kept hers up. Tariq kept his steady.
At the second junction, where the corridor narrowed and the cameras multiplied, they turned east. The maintenance manifest had carried them past the first checkpoint. The second required something Tariq did not have, and so they took the service ladder that climbed the inside of an old grain silo, its rungs slick with decades of condensation, and emerged onto a roof that overlooked the canals.
The canals were black and slow. Above them, the City's upper levels rose in their terrible geometry, all buttress and bridge, the spires of the Authority visible in the distance like the spines of a sleeping animal. Beyond the spires, the broadcast rings turned, turning, turning.
Vela stood at the roof's edge and looked out.
"Cairn," she said, and the word had a weight to it, a heft, as though speaking it had cost her something. "I heard it first from my sister. Before the Cleansing. There was a district at the edge of the old maps. A place where the dead were remembered. The Authority said it was obliterated. They said it had been a center of resistance. They said it was where the first harmonic experiments were conducted, and that the experiments had failed, and that the failure had to be erased."
Pip listened with his whole body. Tariq listened with his eyes.
"But the maps are wrong," Vela said. "The Authority lies about maps the way other governments lie about budgets. A place that was obliterated does not have harmonics. A place that was obliterated does not pulse. A place that was obliterated does not call out on a frequency that only I can hear."
She turned from the canals. The dawn was coming up behind the spires, a thin line of grey that would soon become orange and then white and then the flat, relentless light of a City that never quite permitted darkness.
"Eira told me there was a cartographer," Vela said. "She told me there was a man who had walked the boundaries of every district and drawn them true. She said he had drawn Cairn after the Cleansing, from memory, because the Authority had taken the original maps and burned them. She said he had hidden the drawing somewhere no one would think to look."
"Where?" Pip asked.
Vela looked at the boy. She saw in his face, for a moment, a thing she had not expected to find. Not hope, exactly. Something older.
"In the harmonics," she said. "In the frequency itself. He encoded it. He was a frequency-sensitive, like me. Like her. Like you."
Pip's mouth fell open. Tariq made a small sound, not quite a word, more the beginning of one.
"Solen Kade," Tariq said.
"Yes."
"The man who triggered the broadcast that killed your family."
"The man who has been listening to the Seven for thirty years," Vela said. "The man who carries the only true map of a place the Authority says does not exist. The man who is asking us, from inside a coordinate that should not be there, to come home."
Pip looked down at the tuning fork in his hand. The dawn light caught it, and for a moment it looked like a small, bright key.
"Then we go," the boy said. "We go now."
Tariq checked the manifest. Vela checked the slate. Pip checked the harmonics, tilting his head, listening to the City's vast, concealed music, the hum beneath the hum, the door within the door.
They climbed down from the roof and into the canal fog, and the fog received them, and the relief operators did not see them, and the cameras turned their blind, mechanical eyes toward other things, and the dawn came up over the spires of the Authority, and the broadcast rings turned, and the coordinate pulsed, and Cairn, which had been erased from every official map and remembered by every unofficial one, waited.
The fog in the lower canals tasted of iron and diesel. Vela kept her mouth closed as she descended the rusted maintenance ladder, breathing only through her nose. Pip climbed ahead of her, quick and sure, his small hands finding holds she would have missed in the half-light. Tariq came last, his heavier boots ringing against the metal rungs in a rhythm the boy had already begun to anticipate, shifting his weight a half-second before each footfall so the sound would fall between the distant splashes of the relief pumps.
Vela had spent three days searching for this boy. She had followed rumors of a feral data-runner who worked the dead-zones near the abandoned reservoir, a child who could slip through the Authority's signal dampeners as though they were not there. She had expected to find a thief. She had not expected to find a listener.
Pip had been crouching at the edge of a frequency dead-zone when she found him, his palms flat against a cracked ventilation grate, his head tilted at an angle she recognized. The angle of a frequency-sensitive. The angle of someone who had heard the harmonics beneath the harmonics and had been unable, ever after, to stop listening. He was eleven, maybe twelve. His hair was the color of canal rust. His eyes were the color of a tuning fork struck in a quiet room.
He had tried to run when he saw her. She had let him run. She had waited. When he came back, twenty minutes later, curious in spite of himself, she had not tried to catch him. She had simply held up the tuning fork. The note she rang was the one her sister had used to call her home from school, three streets and two districts away. The note carried.
The boy had sat down across from her on the broken tile. He had not spoken for a long time. When he finally spoke, his voice was bright and slightly hoarse, the voice of a child who had spent too many nights in unheated spaces and not enough in conversation.
"You hear them too," he had said.
"Yes."
"The Seven."
"Yes."
"They're real."
"Yes."
He had looked at her then with an expression she would remember for the rest of her life. Not relief. Recognition. The look of someone who had been told, for years, that the music in their head was a malfunction, and who had just met someone who knew the song.
She had bought him a meal. She had told him about Tariq. She had told him about Cairn. She had told him, when he asked, about the Marsden family. About the broadcast that killed her mother and father and two of her brothers. About the sister who had survived. About the sister who had not survived. About the grief that lived in her like a second heartbeat, the grief that had driven her into the canals and the dead-zones and the quiet places where the Authority's frequencies could not reach.
Pip had listened to all of it. When she finished, he had reached into the inner pocket of his oversized coat and produced, with the theatrical care of a magician, a small cracked holo-recording.
"Got this off a runner who got it off a runner who got it off the broadcast tower, the night they cut the signal," he had said. "Cracked, but it still plays. It's Cairn's last broadcast. The one they say was destroyed."
Vela had held the holo-recording in her hands. It had been warm from his pocket. She had looked at the crack that ran through its center, a hairline fracture that split the projected image into two shimmering halves.
"It is damaged," she had said.
"It's cracked," Pip had agreed. "Cracked's not destroyed. Cracked just means the signal's split. Means you have to listen with both ears."
She had paid him more than the holo-recording was worth. She had told him about the coordinate. She had told him about the door. She had not yet told him that he could amplify signals, that the natural ability she had sensed in him at the dead-zone was the rarest thing left in the City, rarer even than frequency-sensitivity, rarer than a tuning fork that could carry across districts. She had not told him because she was not yet sure how to tell him. She was not yet sure how to tell a child that the Authority had spent decades trying to breed or steal that ability, that the broadcasts that had killed her family had been, in part, attempts to locate and neutralize children like him, that the City's silence was, in part, the silence of children who had learned to hide what they could do.
She would tell him. Later. When they were safe. When they were on the other side of the door.
Now, climbing down through the fog, she listened to the boy's breathing and to Tariq's careful footfalls and to the distant, muffled groan of the relief pumps, and she thought about the price of cracked holo-recordings. She thought about the runners who had carried this one through three sets of hands to reach a child in the lower canals. She thought about the people who had preserved Cairn's last broadcast in spite of everything the Authority had done to erase it.
The ladder ended at a narrow concrete walkway. Pip dropped down first, landing with the soft competence of someone who had spent years navigating surfaces the Authority did not maintain. Tariq followed. Vela came last, her boots finding the wet stone with the careful precision of someone whose balance had been trained, over many years, to compensate for frequencies that pulled at the inner ear.
The walkway ran along the side of a vast cylindrical chamber. Above them, the ceiling was lost in darkness. Below them, visible through gaps in the rusted grating, was the reservoir itself: a body of still, black water that reflected nothing. Pip had told her, on the journey down, that the reservoir had not been drained. The Authority had simply sealed it. They had sealed it because the water, when the City's broadcast rings turned in certain configurations, would carry the suppressed frequencies. The water remembered. The water had always remembered. The Authority had not been able to make it forget.
Vela knelt at the edge of the walkway. Pip knelt beside her. Tariq remained standing, his hand resting on the strap of the bag that held the broadcast equipment, his eyes on the walkway behind them.
The water below was black. The stone beneath her knees was cold. The air tasted of iron and diesel and, beneath those things, of something older, something that reminded her of the harmonics in the tuning fork, something that was not quite a smell but was not quite not a smell either.
Vela reached into her coat and produced the holo-recording Pip had sold her. The crack in its surface caught the faint light from the distant grate. She held it over the water.
"When I was seven," she said, "my sister Eira found a broken music box in the abandoned district near our apartment. The mechanism was cracked. Most of the notes were missing. But the few that played were clear."
Pip looked at the holo-recording in her hand. He did not ask what the music box had to do with anything. He waited.
"She wound it up every night for a year," Vela said. "She would hold it to her ear and close her eyes and listen to the notes that were missing as carefully as she listened to the notes that were there. She said the silence between the notes was where the music really lived. She said you could not understand a cracked thing if you only listened to the parts that still worked."
Tariq made a sound that was almost a laugh. Almost.
"Your sister," he said. "I would have liked to have met her."
"You would have," Vela said. "You would have liked her."
She set the holo-recording on the stone between them. The crack ran through its center like a river on a map. She did not play it. Not yet. The playing would come later, in the hidden studio, after they had confirmed the coordinate, after they had mapped the door. For now, the holo-recording was simply an object. A relic. A thing that had been preserved by runners who believed, in spite of everything, that the broadcast it carried was worth carrying.
"The Authority wants us to believe that Cairn was erased," Vela said. "They want us to believe that the Marsden family was erased. They want us to believe that the Seven are a malfunction, a glitch in the broadcast rings, a thing that will be corrected when the new rings come online. They want us to believe that the silence is normal. They want us to believe that the door is not there."
Pip looked at the black water below the grating. He looked at the holo-recording on the stone. He looked at the tuning fork in his own hand, the one Vela had given him, the one that carried across districts.
"But cracks are not erasures," Vela said. "Cracks are openings. A crack in a holo-recording is an opening through which the signal can leak. A crack in a music box is an opening through which the missing notes can be heard. A crack in a broadcast is an opening through which the truth can leak out."
She picked up the holo-recording. She held it for a moment, feeling its weight, feeling the warmth that was not warmth but the residual frequency of the broadcast it carried, the echo of Cairn's last transmission, the voice of the man who had been erased from every official map and remembered by every unofficial one.
Then she handed it to Pip.
"You carried it here," she said. "You should be the one to carry it through."
Pip took the holo-recording. He held it carefully, the way he held the tuning fork, the way he held every object that had once been part of a frequency. He looked at Vela. He looked at Tariq. He looked at the black water below the grating, the water that remembered, the water that carried.
"The door," he said. "You said the door is in the harmonics. In the frequency itself."
"Yes."
"And the coordinate Cairn is broadcasting, the one the Authority can't hear, the one only frequency-sensitives can hear, that coordinate is the door's location."
"Yes."
"And we have to find it. We have to tune to it. We have to go through."
"Yes."
Pip was quiet for a moment. The relief pumps groaned in the distance. The fog drifted across the walkway, thinning, thickening, thinning again.
"Vela," the boy said.
"Yes."
"If the door is real. If Cairn is real. If the Seven are real. Then the Authority has been lying. For thirty years. About everything."
"Yes."
Pip looked down at the holo-recording in his hand. The crack in its surface caught the faint light one more time, and for a moment, through the crack, Vela thought she could see something moving. Not an image. A frequency. The shimmer of a broadcast that had been preserved in spite of everything the Authority had done to erase it.
"Then we go," Pip said. "We go now. We go through."
Vela stood. Tariq offered her his hand. She took it, and he pulled her up, and they stood together on the walkway, the three of them, the tuner and the broadcaster and the boy who could amplify signals, and above them the City hummed with its vast, concealed music, and below them the water remembered, and somewhere in the harmonics, in the frequency beneath the frequency, in the door within the door, Cairn waited.
She took the tuning fork from her coat. She held it up. The note she rang was the one Eira had used to call her home. The note carried. It carried down through the fog and across the water and into the stone and into the harmonics, and from somewhere far away, from somewhere that should not have been there, from somewhere that was waiting, the coordinate answered.
The door opened. Not with a sound. With a frequency. With a note that had been waiting, beneath the City's silence, for thirty years. The fog thinned. The water below the grating began, very faintly, to hum.
Vela looked at Tariq. Tariq looked at Pip. Pip looked at the tuning fork in his hand, and then at the holo-recording in his coat, and then at the walkway ahead, which led, through a series of maintenance passages and sealed tunnels and frequency dead-zones, to the place the Authority said did not exist.
"The broadcast rings will turn again at midday," Tariq said. "If we are not through before they align, the dampeners will lock us out."
"Then we do not let them align," Pip said.
Vela almost smiled. Almost.
"No," she said. "We do not let them align."
She took the first step. Tariq took the second. Pip took the third. The fog closed behind them. The relief pumps groaned. The dawn came up, somewhere far above, over the spires of the Authority, and the broadcast rings began, very slowly, to turn.