In the gothic clockwork metropolis of Neovictoria, where twelve werewolf packs descended from time-manipulating clockmakers rule with iron fangs and silver contracts, twenty-two-year-old Iskra Volkov has spent her life hiding a forbidden secret: she hums a wrong frequency that can fracture time itself. Desperate and debt-ridden after her younger sister falls gravely ill with a temporal sickness, Iskra sells herself at the brutal Chrono-Auction, a market where the poor are purchased by the powerful packs for servitude, soldiering, or far worse. She is bought for an astronomical sum by Caspian Finch, the cold, feared Alpha of the Finch Pack, a man cursed with Temporal Dysplasia that causes his wolf form to shift unpredictably between ages, a mighty beast one shift, a limping ancient the next, a terrified pup the next. He does not want a servant. He needs a cure. The contract etched into their skin with burning silver binds her to him for five years, forbidding escape, demanding obedience, and triggering agony whenever they are separated by distance. Iskra despises him for owning her. Caspian distrusts her, suspecting she may be a Synchrony weapon sent by rival packs to destroy him from within. Forced into his gothic mansion, surrounded by hostile shifters who view her as a bought human and a weakness in their Alpha, Iskra fights him at every turn. But when her involuntary humming unexpectedly stabilizes his curse, Caspian realizes she is something far rarer than a tool. She is a Song-Wolf, the last surviving descendant of the erased Thirteenth Pack, a bloodline of female shifters whose wolf forms manifest as sound rather than physical transformation. She is also his fated mate, the missing half of his fractured wolf-song, and the only being in existence who can either save his pack or destroy the entire Synchrony. Their forced proximity breeds violent clashes that bleed into reluctant desire. Their contract marks begin evolving into mating marks, a bond that cannot be completed without genuine emotional surrender. But when Iskra uncovers the devastating truth, that Caspian's own father led the massacre that erased her bloodline, and Caspian knew, she flees into the arms of the underground rebellion and the mother she believed was dead. The mating bond unfinished, Caspian begins to die. His wolf form unravels into pure temporal chaos. The Synchrony prepares the Grand Escapement, a ritual to permanently seal their dominion by sacrificing Iskra as the last Resonant. Now Iskra faces an impossible choice: let the man who bought her perish and take his bloodstained pack with him, or forgive the unforgivable and complete a bond that could shatter the Synchrony's tyranny forever. He is not asking for forgiveness. He is not asking for love. He is kneeling at her feet, dying by inches, offering her the only thing his father never gave her ancestors: a choice. Their mating does not fix everything. It burns the old world down and forces them to build a new one from the ashes, together, scarred and bloodied and finally free.