Human girl Luna is captured by a werewolf pack and offered to Alpha heir Kael as a sacrifice to calm the beast tide. Kael intends to tear the fragile human apart, but the instant he touches her, the soul resonance of fated mates is awakened. Kael carries the beast-tide curse left by his mother, which will turn him into a mindless beast on the night of the lunar eclipse. Luna goes from sacrifice to prisoner, and then from prisoner to both the vessel and the antidote for the curse. Caught between fear and desire, she takes Kael's curse into her body and tames the beast within him. When the old pack hunts them in the name of pure blood, Kael awakens an ancient golden-wolf bloodline to protect Luna and defeats the enemy. In the end, the curse and the golden-wolf bloodline coexist within Luna. Kael turns against the pure-blood tradition for her, establishes a new pack, and the two complete an eternal mate bond beneath the moonlight and fire.
