- Twelve-year-old Callum Hunt has grown up knowing three rules by heart. Never trust a magician. Never pass a test a magician gives you. And never let a magician take you to the Magisterium. Call is about to break all the rules. And when he does, his life will change in ways he can"t possibly imagine. The Magisterium series is a five-book series of fantasy novels, one book for each year of Call"s life between twelve and seventeen.