Selene, a young she-wolf of the Silverfang Pack, carries the grief of her mother's death and a hatred of vampires as sharp and particular as a wound that never closes. Yet she was born marked — a pale crescent on the inside of her right wrist, the sign of the Blood Moon prophecy, which the elders call the mark of a doom-bringer. When her companion is killed on a border hunt, Selene collides with Kael, heir to the vampire bloodline. He tells her the death was not his doing: Valos, head of the vampire elders, staged the killing to drag the two peoples back into war. Before either can walk away, a blood-resonance binds them — heartbeat to heartbeat, feeling to feeling — and suddenly both packs and both bloodlines are hunting them. Driven together through a land that wants them dead, they begin to unravel the prophecy itself. The tale of a sacrifice was a lie Valos invented; the crescent mark was never a curse at all, but the seal of an ancient peace covenant. As they fight the power behind the killings and the centuries of hatred it feeds on, the truth comes to a head at the Blood Moon Altar, where Valos means to seize the altar's power for himself. Selene and Kael break his scheme, and in its place forge a new covenant between wolves and vampires — choosing, with their own hands, to end a hundred years of inherited hatred.