Rose Elmsworth has a secret. For eighteen years, the world has been divided into the magically Gifted and the non-magical Ashkind, but Rose's identity is far more dangerous. At fifteen, she has earned herself a place alongside her father in the Department, a brutal law-enforcement organisation run by the Gifted to control the Ashkind. But now an old enemy is threatening to start a catastrophic war, and Rose faces a challenging test of her loyalties....