The heat in the furnace died between one breath and the next.
Mirelle felt it go, a sudden absence beneath her palms, the way a heart stops in a chest you have been holding. She stood with her sleeves pinned at the elbows and her wrists bare to the grit of glass dust, and for one suspended moment she believed she had succeeded. The shard on the iron cradle before her had been screaming for three days. It lay in its cradle of slag wool, a rough tear of black crystal the length of a child's forearm, and every hour since the diggers had brought it up from the Glassreach's edge it had keened a thin, high note that set dogs baying two streets over and soured milk in the cellars of Thornhallow. Now, finally, the wail thinned to a whisper. Then to silence.
"Mirelle." Seren's voice, behind her. Soft, as always. A warning dressed as a name.
She did not turn. Her palms were still pressed to the glass, her fingers splayed wide in the old binding posture, her breath held tight in the cage of her ribs. The shard lay quiet. The quiet felt earned. After three days of coaxing, of feeding it her own warmth through the iron cradle, of whispering the Thorncleft names into its fractured surface until her throat was raw, she had finally brought the screaming thing to heel. She allowed herself one heartbeat of triumph, just one.
Then the furnace collapsed.
Not outward, not in any way she could have braced against. It folded inward, as if something beneath the bricks had opened a mouth and inhaled. The coals that had glowed cherry-red since dawn turned grey in a flicker, shedding their heat in a single pulse that rolled across the floor and climbed her bare arms. She smelled the iron go cold. She smelled the slag wool char. She smelled something older, something with a mineral tang that lived in her memory from before memory, when she was small enough to sit in her eldest sister's lap and watch the first lesson of binding burn a ring of soot into the rafters.
"Step back," Seren said, and her hand closed on Mirelle's shoulder and pulled.
The shard screamed.
It came off the cradle in a sheet of black glass, unsupported, upright, a torn blade taller than either of them. The sound that came out of it was not the thin keening of the days before. It was lower. It had weight. It had direction. It rolled across the workshop floor, over the strewn cullet and the spilled binding salt, and struck the far wall where Seren's portrait hung in its driftwood frame, the only painting of the eldest sister Mirelle had ever managed to finish before the disappearance had taken the rest of her subjects from the easel.
The glass in the portrait cracked. A single line, pale and jagged, ran from the painted brow to the painted throat. Seren's painted mouth opened, or seemed to, in the sliver of a second.
Then the windows went.
One after another, up the lane, the panes burst inward with a series of flat reports that sounded, to Mirelle's ears, like a line of soldiers dropping. The workshop's tall casements shattered first. Then the cobbler's, across the way. Then the chandler's. She stood with her sister's hand on her shoulder and watched the shards rain into the street in silver arcs, catching the dusk light, falling like the confetti at a forgotten festival. Somewhere down the lane a woman began to shriek, and a dog began to howl, and the dog was answered by another dog three streets away, and then by every dog in Thornhallow, as if the shard's voice had found in them the resonance it could not find in the cooling furnace.
The shard fell.
It hit the floor of the workshop on its edge, rang once against the flagstone, and lay still. The silence that followed was worse than the noise. It was the silence of a room in which a death has just occurred, and everyone present has not yet understood it.
Mirelle wrenched her gaze from the ruined portrait to the shard. It lay where it had fallen, three paces from the cradle, its torn edges still humming faintly with the heat of its long screaming. She could see, in the black glass, a dim reflection of her own face, drawn and white, dusted with grit. She could see, behind that reflection, the deeper reflection of the workshop, the rafters, the cold forge, the long bench where Seren's tools still waited in their rows, undusted since the day the eldest sister had walked out the door and never returned.
"Don't touch it." Seren's voice was quiet, but the quiet had teeth in it.
"I'm not." Mirelle's own voice came from a long way off, and it cracked on the second word.
The black shard lay on the floor. It did not move. It did not need to. Across the lane, the windows of every house on Thornhallow's lower street were dark with fallen glass, and the dusk poured in unfiltered, and the shards in the cobbles caught the last of the light like a field of small, broken mirrors.
She had been so close. She had been certain, this time, that the old binding would hold. Three days she had poured into the work, feeding the screaming shard her own warmth through the cradle's iron bones, whispering the names her mother had taught her and her mother before her, the Thorncleft names, the seven names, the names that held. She had felt the shard quiet beneath her hands. She had felt it lower its voice. She had believed that her inheritance, at last, would be enough.
The furnace lay dead. The coals were powder. The bricks themselves had a frost on them, in the middle of summer, and when she reached out, without thinking, and laid her palm against the nearest one, the cold went through her skin and into the bone of her hand and stayed there, humming faintly, as if the cold had its own small life.
"Mirelle." Again, from behind her.
"I know." She did not turn.
She knew what had happened. She knew the shape of the failure before she had to name it. The shard had not been bound. The shard had used her binding, had drunk the warmth she had fed it, and had used that warmth to throw its voice outward, to crack every pane of glass on the lower street, to find in the long line of houses a body for its own broken wailing. She had not silenced it. She had given it a throat.
Across the lane, someone had begun to weep. The sound was small and ordinary and utterly out of place in the aftermath of what had just occurred. A mother, perhaps, scolding a child who had cut a hand on the fallen glass. A man, swearing, sweeping. The ordinary sounds of a street learning that it had been wounded.
Mirelle finally turned.
Seren stood behind her in the doorway of the workshop, half in, half out of the dusk. She wore her old grey dress, the one with the torn hem she had not bothered to mend in seven years. Her hair was loose on her shoulders, and her face, in the failing light, had the calm, lined look of a woman who had seen this kind of thing before and had not been spared it the first time, either. She was not a ghost. Mirelle had learned long ago that her sister was not a ghost. She was something more difficult.
"You fed it yourself," Seren said. Not an accusation. A measurement.
"I did what you taught me."
"You fed it too much."
"I fed it what it asked for."
Seren's mouth softened, just at one corner. It was the look she had worn the day Mirelle had bound her first clear pane, a hundred small failures before it, and the look she had not worn since the day she had walked out the door.
"Then it asked for too much," she said, "and you gave it. That is the old lesson, Mirelle. The one I kept meaning to teach you next."
The shard on the floor hummed faintly. Mirelle did not look at it. She looked at her sister instead, in the doorway, in the dusk, half here, half not, and felt the old pull in her chest, the pull that was not love and not grief but somewhere in the country between them, where the binding names lived, where the old instructions waited in the iron of her own bones.
"The windows," she said, because she had to say something practical, because if she did not say something practical she would say something else and not stop.
"I'll go to them." Seren stepped back into the dusk. "Stay with the shard. Don't touch it. Don't speak to it. If it speaks to you, you did not hear it. Understood?"
"Understood."
Seren was gone. The dusk swallowed her grey dress, swallowed her loose hair, swallowed her face, and only the sound of her footsteps on the cobbles, faint and ordinary, lingered for a moment before it too was taken. Then Mirelle was alone in the workshop with the dead furnace and the cracked portrait and the black shard humming on the flagstones.
She did not touch it. She did not speak to it. She stood very still and watched it, and it watched her, and across the lane the weeping had stopped and the sweeping had stopped and the whole of Thornhallow's lower street had gone quiet in the way that streets go quiet when something they have just witnessed has finally finished, and they are waiting to see if it will begin again.
The quiet lasted three breaths. On the fourth, the shard rang like a struck bell, a sound so pure it had no temperature, only direction, and the direction was down, into the floor, into the bones beneath the floor, into Mirelle.
She pressed her palm to the shard before she could choose not to.
The workshop vanished.
She stood in a city she had never seen, though she had dreamed it twice as a child and once, weeping, at thirteen. Towers of black glass climbed a hillside scarred by fire. The river below ran white where it should have run green, and the air tasted of tin and something older, something that lived in the back of the throat like a word half-swallowed. Smoke rose from the upper quarter in slow, deliberate columns, as if the fires were being fed by hand. The sky above the city was the color of a bruise left too long, purple shading to a sickly yellow at the horizon, and in that yellow a shape moved, or did not move, and Mirelle could not make her eyes resolve it.
A woman stood beside her in the street. Not beside her, exactly. Through her, partly, the way a reflection sits behind the glass it reflects in. The woman was tall, taller than Seren, and her hair fell past her waist in a sheet of white that moved without wind. Her eyes were silver, not grey-silver, not the soft pewter of Corvin's gaze in low light, but silver as a minted coin, silver as a mirror left too long in salt air, and when she turned her head to look at Mirelle the motion was wrong, too smooth, as if the neck had more joints than a neck should have.
"You came," the woman said, and her voice had no accent, no place, no time. "I kept the door. I did not know if you would come."
Mirelle tried to speak. Her lips would not part. The binding held her throat the way a hand holds a thrush, gently, with full knowledge of the outcome.
"Listen," the woman said. "There is not much time left in this glass. They cut the lens, and the lens remembers the cut, and the cut will bleed if you do not hear me."
The city pulsed around them. A tower leaned and did not fall. A bell rang from somewhere underground and the sound came up through the soles of Mirelle's feet. The smoke thickened. The bruise-sky lowered by a hand's breadth, and the shape in the yellow resolved, for one sickening instant, into a man made of light standing on a roof, and the man made of light was holding something that screamed.
"His name was Pellamar," the woman said, still looking at Mirelle. "He was the binder of the south reach. He bound the river to the city and the city to the hill and the hill to the sky, and when he was done he was no longer a man. He was a coordinate. He was a point the world turned around, and the world hated him for it, and so the world took him apart."
Mirelle's hand, somewhere far away in the workshop, twitched against the flagstones. She felt the cold of the stone through the vision, and the cold was real, and the fire-towers were real, and the silver eyes were real, and the screaming thing in the hands of the light-man was real.
"They will come for you," the woman said. "They will come because you are a Thorncleft, and the Thornclefts hold the last instruction, and the last instruction is a door. Do you understand?"
Mirelle understood nothing. Mirelle understood everything. Her mouth opened, finally, against the binding's gentle hand, and what came out was not a word but a breath, and the breath was enough.
"Then hear this," the woman said, and her voice lowered, and the lowering was a kindness and a cruelty. "There is a boy in black glass. He is not a boy. He is a king, and he is not a king. He is the hollow made into a throne, and the throne is broken, and the breaking will be your sister's, if you do not reach her first."
The city folded. The towers bent toward each other like conspirators. The river ran backwards up its bed. The smoke rushed inward toward a center that was not a place but a person, and the person was Mirelle, and the person was the woman, and the person was a child Mirelle had never met, a child with a crown cut from a single sheet of black glass, and the crown was not on his head but in his hands, and he was turning it, and the turning was a question.
She saw the crown. She saw his face beneath it, young and older than young, the way certain flames are. She saw the glass catch the bruise-light and throw it back as a different color, a color she had no name for, a color that smelled of iron and rain. She saw his fingers whiten on the rim. She saw his mouth open.
He spoke. The words did not come to her as sound. They came to her as pressure, as the memory of a door slammed in a house she had never lived in, as the taste of blackberries eaten in a garden that had burned. The words were: I kept the seat warm. I kept the seat warm. I kept it warm for you.
The shard cracked under her palm.
The workshop rushed back, the furnace, the dusk, the portrait, the cracked flagstone, her own hand bleeding in two neat lines where the black glass had bitten her. She was on her knees. She did not remember falling. The dusk had deepened to the blue that is not yet night. Somewhere outside, in the lower street, a shutter banged once and was still.
The shard lay against her knee, still humming, but lower now, the way a heart slows when it has given all it has to give. A crack ran through its center from the upper left to the lower right, and in the crack something moved, a faint light, a faint warmth, like the last ember in a fire the morning after.
Mirelle stared at her hand. The blood welled along the cuts in slow, deliberate beads, as if the wound were being measured. She did not move to staunch it. She sat very still on the cold floor and watched the blood climb the side of her index finger and hang there, a perfect drop, and in the drop the dusk and the shard and the workshop were all reflected, small and whole.
A step in the corridor. Then another. Then Seren was in the doorway, and the dusk framed her like a portrait, and her face was the face Mirelle had last seen at thirteen, the face that had gone out of the door one autumn morning and not come back, and it had not aged, or it had aged in the way that glass ages, by becoming more itself.
"What did it show you?" Seren said. Her voice was steady. Her hands were not.
Mirelle opened her mouth. The words she had heard in the vision were still inside her, pressed against her teeth like embers pressed against a grate. She could feel their heat. She could feel their weight. She did not trust her own throat to carry them without burning her.
"A city," she said. "A woman with silver eyes. A boy with a crown of black glass." She paused. The drop of blood on her finger fell and struck the floor with a sound so small it was almost not a sound. "She said his name. She said he kept the seat warm."
Seren did not move. The dusk did not move. The shard did not move. Only Mirelle's blood moved, spreading in a thin dark line across the flagstones toward the shard, and the shard, at the touch of it, hummed a half-tone higher.
"Don't," Seren said, too quickly, and was across the room in two strides, and had Mirelle's hand in hers, and was wrapping her own sleeve around the cuts with a fierceness that was not quite tenderness. "Don't let it have your blood. Not yet. Not until I have taught you what it will cost."
"You have not taught me anything," Mirelle said. "You vanished. You let me grow up in a house that talked about you like a missing tool. You let Corvin blame himself. You let Mother break, and Father break after her. You let me learn the craft from a book and a guess, and now you come back with your grey dress and your dusk and your hands that know exactly where to press, and you tell me do not let it have my blood." Her voice was steady, too. Her voice was very steady. "You owe me an instruction before you owe me a warning."
Seren's hands stopped. She looked at Mirelle, and the look was the look from the vision, the one that sat behind the glass it reflected in, partly through, partly not.
"I know," Seren said. "I know I do. I will. Tonight, after the street has gone to bed. I will show you the second half of the lesson, and the second half is not a lesson at all, it is a confession, and I have been rehearsing it for nine years."
She tied the sleeve tight. The blood slowed. The shard's hum lowered again, reluctantly, the way a child lowers its voice when told to.
"Until then," Seren said, "stay away from the windows. Stay away from the shard. Stay close to the portrait. The portrait knows your face, and it will not lie about who you are."
Mirelle looked at the cracked portrait above the mantel. The man in the portrait looked back. He did not smile. He did not frown. He held his binding-tools the way a man holds a child he is not sure he should be holding, and his eyes, in the cracked glass, were the color of the river that ran white in the burning city.
Somewhere in the lower street, a bell began to ring. It was not the hour bell. It was the other bell, the one that hung in the small spire above the constable's office, the one that had not rung in Mirelle's lifetime, the one that the children of Thornhallow were told was only ever rung when the river came up over the breakwater, or when a binding had been opened in the town without the priests' leave.
Seren turned toward the door. Her face, in the dusk, was the face of a woman who had been waiting nine years for exactly that sound.
"Now," she said softly. "Now you will see."
The bell kept ringing, a flat brass note that did not echo so much as press itself against the walls of the room. Seren moved first, her hand on the doorframe, her head tilted as if she were listening to something underneath the bell, something lower, something the brass could not drown.
"Listen," she said. "Past it."
Mirelle listened. Beneath the bell, beneath the creak of the old house settling into its foundations, she heard it. The shard on the table had gone silent, but the air around it was not silent. It was humming in a register she felt in her teeth, a pressure that moved the fine hairs along her forearms, that made the skin of her bandaged hand prickle as if the blood beneath it had remembered a second purpose. She could not have said how she knew, but she knew. Something else in the house was answering.
"The portrait," Mirelle said.
Seren turned back toward the mantel. The cracked glass above the painted man had begun to move. Not the glass itself, but the thing trapped inside the glass, the small pale flame she had once mistaken for a trick of the varnish. It was no longer small. It pressed against the inside of the crack the way a moth presses against a lantern, and where it pressed, the crack widened, hairline splitting into hairline, the whole portrait beginning to fissure along the lines of an old wound that had never healed. The painted man's eyes caught the light from the dying hearth, and for a breath they were not painted at all.
"Don't look away from me," Seren said. "Whatever happens, keep your eyes here."
Mirelle did not want to. The pull of the portrait was enormous, a gravity that worked on the part of her that had always responded to broken glass. It was the same pull she had felt in the gutter when she was seven and had picked up a shard of a green bottle and held it to the light and watched the world inside it rearrange itself into something more honest than the world outside. It was the pull that had brought her to apprenticeship. It was the pull that had brought her here.
"Corvin said it was a shard," Mirelle said, her voice thin. "He said it was just a shard."
"Corvin is right," Seren said. "It is a shard. But a shard of what, Mirelle. Have you asked that question tonight."
Mirelle had not. She had been so busy surviving the lesson that the curriculum had escaped her.
"Ask it now," Seren said. "Ask it out loud. The shard is listening. It always listens."
Mirelle swallowed. The bandaged hand throbbed in time with the bell. The air tasted of iron and of something older, the mineral breath of deep wells and unmapped caves.
"Shard," she said, "what are you a piece of?"
The hum shifted. The fine hairs on her arms flattened and then stood again. The hearth gave a single pop, a knot of resin bursting in the wood, and the firelight jumped. On the table, the dark triangular fragment lifted a finger's width off the scarred surface, turned once in the air as if considering her question, and set itself down again, sharper than before.
"Once," Seren said, "in the age before the Tidal Lens was built, before the priests made their pacts with the river, the mages of what is now called Ophir Bend forged a great working. They called it the Unbound Mirror. Not a glass to look into. A glass to look through. A lattice of polished planes, each one cut to a different angle, each one tuned to a different facet of the world's true nature, and they set them in a frame of white iron in a hall beneath the western cliffs. They used it to see across distances. To see through walls. To see into the hearts of their own citizens when those citizens had begun to lie. They used it to see the future, and the future, when they saw it, wept. They used it to see their enemies, and their enemies, when seen, could not be unseen. The Unbound Mirror was the most dangerous thing in the realm, and it was also the most beautiful. People traveled from the inland cities to stand in its presence, and they came out weeping or laughing or silent. Some came out empty."
Mirelle did not speak. She did not move.
"The War of Lattices came," Seren said. "A coalition of river-priests and inland kings who had grown afraid of what the mages saw. They marched on the hall. The mages fought. They lost. The victors could not destroy the Mirror. Nothing they threw at it would break it. So they did the next worst thing. They shattered it into seven hundred pieces and scattered the pieces across the realm, into fields and wells and the pockets of children, into the bellies of birds and the roots of trees, into the river itself. They thought that if no piece could find another piece, the Mirror would sleep forever. They were wrong about one thing. They thought forever meant forever."
The shard on the table hummed again, a low clear note that Mirelle felt in the bones of her wrist. She looked at it and understood, with a certainty that had nothing to do with logic, that the dark triangle was not an imitation of anything. It was a piece of the original, and the humming was the original piece, remembering itself.
"Across the realm," Seren said, "the fragments are waking. I have felt four of them in the last year. One in a well outside the village of Sallowford. One in the cornerstone of a chapel at Millhaven. One in the eye of a man who came to beg at our door. And now, in our table, this one. They wake when the river is high, when the air is thick with old weather. They wake when a glassbinder of the old line is born into the world and begins, without knowing it, to call. The fragments remember each other. They want to be whole again. And when they are whole, Mirelle, the Unbound Mirror will stand again in some hall, and whoever stands before it will see what cannot be unseen."
The bell in the constable's spire had stopped. The silence it left was not a silence at all. It was a listening, the way the shard had been a listening. From somewhere below, from the direction of the street, came the sound of many boots on the cobbles, and the higher sound of a voice raised in the cadence of a binding-prayer, the syllables stretched out as if each one were being weighed.
"The priests have come," Seren said. She did not sound afraid. She sounded like a woman who had been waiting for the priests for nine years and was relieved, in some way that Mirelle could not fully parse, that the waiting was over.
"Seren," Mirelle said, "what happens now."
"Now," Seren said, "you learn the second half of the lesson. Sit down. Take the shard in your unbandaged hand. Do not flinch. Do not drop it. Hold it the way you hold a name you do not want to forget."
Mirelle sat. The chair was cold through the fabric of her dress. She reached across the table with her right hand, the hand that had never bound, the hand that had been kept clean of the work for her own protection, and she closed her fingers around the dark triangle.
The cold came first, and then the heat, and then neither cold nor heat but something that was not a temperature at all, a third thing that her skin invented a new word for and forgot immediately. She did not drop it. She held it the way Seren had told her to hold it, like a name, like a vow, like a person she had wronged and was trying to carry home.
"Good," Seren said softly. "Now look at the portrait."
Mirelle looked. The crack in the painted glass was no longer a crack. It was an opening, and through the opening, instead of the painted man's face, she saw a woman. The woman was old and silver-eyed and stood in a hall of white iron, and behind her, on a frame that had been broken and remade a hundred times, hung a great lattice of polished planes, each plane reflecting a different room, a different city, a different hour. The woman looked back at Mirelle with an expression Mirelle recognized. It was the expression of someone who had been waiting a long time to be recognized.
"You see her," Seren said. "She is the first of the binders. She is the one who forged the Mirror. She is also the one who broke it. She has been waiting inside the portrait for as long as the portrait has hung in this house. She has been waiting for a Thorncleft with both hands open."
The woman in the portrait opened her mouth. The sound that came out was not a sound. It was a binding, complete and self-contained, the kind of working that would have taken Mirelle three years to learn and Seren another three to refine, delivered in a single syllable. Mirelle heard it in her marrow. She heard it in the shard. The shard answered.
The dark triangle in her hand flared white at its edges, and the white was not light. It was the visible shape of a memory, and the memory was of a city burning, and in the burning a woman walking out of a hall with a child on her hip and a piece of broken glass in her hand, walking west, walking for years, walking until she reached a fishing town at the mouth of a river and put down the glass and picked up an apron and began to pretend she had always been a baker's wife. The memory was not Mirelle's. It was her grandmother's. It was her grandmother's mother before her, and her grandmother's mother before that, all the way back to the silver-eyed woman in the portrait, the unbroken line of binders who had carried the fragments away from the burning city one by one, hiding them, forgetting them, passing them down in cradleboards and wedding rings and the corners of inherited frames.
Mirelle came back to herself slowly, the way one comes back from deep water. The portrait had closed again. The painted man was only a painted man. The shard in her hand was dark again and warm, and her hand was steady, and her breath was even, and the boots in the street had gone quiet.
"Corvin," Mirelle said. "Corvin saw this."
"Corvin saw a piece of it," Seren said. "He saw the shard in the gutter. He saw the boy who picked it up. He did not see the rest, because the rest was not his to see. It was ours. It was mine. And now it is yours."
The door downstairs opened. A voice, deep and unhurried, called up the stair.
"Seren Thorncleft," the voice said. "By the leave of the Tidal Lens and the constable of Thornhallow, open this door and bring out the fragment. We know it is here. We have felt it wake."
Seren looked at Mirelle. In her face there was no fear. There was the thing Mirelle had seen outside, the thing that had been in her walk and her voice and the way she had tied the bandage, the thing that had carried her across nine years and a war and a river. There was love. There was the older love, the one that does not ask to be thanked.
"Answer them," Seren said. "Open the door. Tell them what you have just learned. Tell them the fragment wakes. Tell them there are others. Tell them the Mirror remembers."
She pressed her hand once over Mirelle's bandaged hand, the lightest touch, the touch of a sister who has done what she could.
"And tell them," she said, "that the Thorncleft line does not forget what it has carried."