It should be a time of celebration. The Enemy of Death is dead; a severed head proof of his downfall. The magical world has no reason to believe otherwise, and Callum, Tamara and Aaron are celebrated as heroes. But at a party held in their honour, things go horribly, brutally wrong. A fellow student is callously murdered, and it seems Call’s worst fears are confirmed: there is a spy in the Magisterium. No one is safe.Now, using the powerful magic they’ve been taught, the trio must risk their lives to track down the killer. But magic is dangerous – in the wrong hands it could bring terrible destruction. And reveal the deadliest secret of all . . .