After years of helping his father fight the monsters that killed his mother, Jules is ready to step out of his role of being a glorified errand boy for his dad and his vampire-hunting crew. But when the idea is quickly shot down for the second time, Jules lets one drink to blow off steam domino into accidentally becoming a vampire's familiar overnight. And the biggest problem is that he can't remember what happened. With tensions high after his father discovers the possibility of a vampire spy in their midst, Jules scrambles to keep his mark a secret and prove himself to the entire crew by hunting down his vampire, following every clue that feels familiar.