Andy Cohen's last year in high school should be all about college prep. But instead, he and the Catmages are working to defeat Principal Saunders, who seems to have finally mastered the awesome powers of the Tilyon, the most powerful Catmage amulet in existence. Meanwhile, Taylor has plans for Becca, and Andy has to face the betrayal of one he trusted the most. Can Andy surmount all these obstacles and help the Catmages win their war, or will Saunders finally have what he wants?