When Professor Briggs vanishes with the piece of demon heart, Finn choses to go after him. But the coordinates lead to the feared mythic labs where even Finn's friends are afraid to go. Searching for answers, Finn comes across the one thing he doesn't expect, the scent of another werewolf. Jumping down a rabbit hole of gruesome experiments, a deadly demon bite, and humans straight from his nightmares, Finn risks losing everything to rescue the girl and unveil the secret she's vowed to keep.