ALA Booklist
This third return to the Magisterium series finds Call, the not-so-evil-after-all reincarnation of a dark overlord, headed back to school with his two best friends Aaron and Tamara. But all, it seems, is not well, as it soon becomes clear that someone is trying to kill Call. The three conduct their own investigation into the would-be murderer, but they're blocked at every step, and Call knows he can't trust anyone. Except, of course, for Aaron and Tamara, right? The crew gets a year older with every book (Call is 14 now), and romantic subplots are starting to peek out even as the narrative grows more ominous. This installment is the third in a planned five-book series, and the plot seems to have stalled somewhat; despite uncertain loyalties and ambiguous characters, this lacks the punch of its predecessor, until the dark turn of an ending. Still, that cliff-hanger finale alone should be enough to get readers to sign up for book four.
Horn Book
Call's third year at the Magisterium (think Hogwarts minus the whimsy) is as dangerous as those previous (The Iron Trial; The Copper Gauntlet). Call struggles with the knowledge that he is the reincarnation of a famed evil mage while dealing with repeated, unexplained attempts on his life. Despite a wheel-spinning plot and an abrupt ending, this installment raises the stakes for book four.
Kirkus Reviews
Book 3 in the Magisterium series continues the escapades of 14-year-olds Call, Tamara, and Aaron as they pursue their Bronze Year studies at the Magisterium.Readers of Books 1 and 2 now know that white Callum Hunt has the soul of Constantine Madden, the deceased Enemy of Death, who had wreaked so much havoc on mages. Also in on the secret are Tamara, of Indian descent, and Aaron, white-Call's best friends and fellow apprentices at the Magisterium, where they are in their third year of mage-studies. But, Call believes, no one else in the Magisterium knows. Ensuing events, however, seem to indicate that someone wants Call dead. Author-collaborators Black and Clare fail to make this third book as engrossing as the first two. The tension surrounding the question of whom Call can trust-could Aaron be trying to kill him?-never gets off the ground: Call stews improbably and shallowly, while astute readers will have figured out who the culprit is long before. Engrossing adventures abound but, alas, are frequently fueled by flimsy, contrived logic that does neither characters nor readers justice. The narrative repeatedly fills readers in on things that happened in the previous book, which reads as, well, filler, and there's no significant movement forward plotwise until the ending setup for Book 4. Only unevenly entertaining and suffering from middle-book syndrome. (Fantasy. 10-14)