All her life, Aila Vinn has been taught to fear the Exceptionals. She's been told that they are dangerous, containing otherworldly powers that make them a threat to the country of Rosan. Marked by a brown X on their left hand, Exceptionals are to be reported on sight. Eight years ago, Aila reported her best friend and watched as the Exceptional Police dragged him away to his death. On her sixteenth birthday, Aila wakes up to find an X on her own hand, irreparably changing the course of her life. In another part of Rosan, Storm Dawson is a thief who lives with his nine brothers. Dirt-poor and faced with a life of hard work and little food, Storm dreams of a world beyond the simple streets of Ferrol. He gets more than he asked for when he finds himself marked as an Exceptional and is torn away from the only life he knows. Both Aila and Storm are reported to the Exceptional Police and supposedly taken to their deaths. But when they wake up the next morning, they begin to realize that the Exceptionals are not what they seem. Secrets are revealed, dangers are faced, and at the heart of the struggle sits a deception that threatens to uproot the entire empire. In the midst of it all, both teens must face a difficult question: How far are they willing to go to get what they want?