The wizard Percy used to be sure of three things: he's a magical prodigy, he's destined to do extraordinary things (as prophesied by his ancestor, the wizard Merlyn), and he would do anything for his twin, Merlynda. But that was before Merlynda was revealed to be the subject of the prophecy, and before Percy became the Hollower, stealing magic for the wicked Morgan le Fey.

Six months have passed since Percy and Merlynda defeated the sorceress, but Percy hasn't been able to reconcile who he is with what he's done. And he carries a dark secret: despite her banishment, Morgan le Fey can still speak to him.

When the mysterious Round Table discovers newly Hollowed objects, Percy is blamed. He escapes on a quest to clear his name but also to make sure whoever is responsible never Hollows anyone again. Joined by Merlynda and Neci (now a royally dubbed knight), an anxious warlock (who seeks to break a curse), and a nonmagical sugar glider (who longs to be a familiar), Percy must defeat this new foe not only to face his past, but to decide what kind of wizard he'll be in the future.