Exiled to die by the Alpha who owned her, Selene Vance makes a desperate bargain with her pack's deadliest enemy. Alpha Kael, the wolf they call the Butcher spares her life in exchange for a blood oath binding her soul to his cause. Forced to train beside him, Selene discovers the man behind the monster, and their forbidden connection ignites into a love that could destroy them both. But her oath is a weapon Dorian intends to wield. To save the wolf who broke the moon for her, Selene must shatter the bond that tethers her and risk everything to reclaim herself.