Natalie Palladino was a normal fifteen-year-old, at a normal school, about to face a normal maths test. Now her codename is Nomad, and she's training to become a secret agent for HELIX. No one can know that sorcery exists. No one can know that HELIX protects humanity from the Inductors. And no one can know that Nomad is a Witness, with a dangerous magical gift. The Inductors are hunting her. If they find her, they will kill her. But there's a traitor inside HELIX, and only a Witness can identify them. The problem is, Nomad hasn't mastered her powers. She can't levitate, fight or wield magic like her fellow recruits. If she's the only hope to stop a sorcerous bomb being detonated, the world is in trouble. The eleventh hour is coming . . .