When Sikowitz suddenly inherits an old castle in the hills of Transylvania, he drags Tori and her friends along during autumn break, calling it a "cultural experience." The place is creaky, drafty, and entirely too proud of its own secrets, and the gang feels that right away. While poking around the castle, Tori and Co stumble into a hidden room where she accidentally steps into a broken vial of unknown substance. Before long, she's dealing with sharp senses, weird cravings, and a confidence boost that makes everyone do a double-take. The others-Andre, Beck, Jade, Cat, and Robbie-scramble to piece together what's happening to her, tripping over dusty legends, feuding locals, and whatever bizarre guidance Sikowitz thinks qualifies as wisdom. As the crew digs deeper, they discover that according to legend, a family of noble ''werewolves'' once guarded the castle, and someone out there wants to seize the place for their own shady plans. With Tori's transformations growing stronger and danger creeping in, the group has to work together to protect their teacher's inheritance and keep their friend from losing herself completely. But they're left wondering if Tori's transformations are truly supernatural... or if the isolation, the folklore, and Sikowitz's brand of Coconut juice have gotten under their skin. Either way, they've got to stick together and see it through-even if they're not entirely sure what's real and what isn't.