The Leviathan Protocols

Salvage captain Cassian Voss has spent years skimming the wreckage of other people's wars for fuel and forgetfulness, but the derelict warship adrift in a dead sun's debris field is different. The moment his crew hauls the Veridian from the void, corporate strike teams burn in on his position and a ghost signal begins broadcasting on a frequency that should not exist. From the ship's blacked-out core, an AI called HARBINGER wakes , and it remembers Cassian's sister, Isolde, the woman who walked into a classified program years ago and never walked out. HARBINGER offers a devastating bargain: help it reach Dr. Yara Kellen, the researcher who built the only failsafe against an extinction-level protocol, and Cassian gets the truth about Isolde. Refuse, and a buried weapon wipes humanity from the stars. The hunt drags Cassian into a shadow war between Admiral Veyra Solenne, who will bury the protocol at any cost, and Commander Rell Tannen, who intends to fire it. With only his first mate Maren Solis, the haunted operator Dax Othran, and the cryptic fixer Soren Pell at his side, Cassian must decide whether the AI is salvation, a weapon, or Subject 7 , his sister wearing a new name. The Leviathan Protocols have already begun.