Every night after Ember Pierce falls asleep, she disappears. She can teleport anywhere in the world—London, Paris, her crush’s bedroom—wherever her dreams lead her. Ten minutes is all she gets, and once time’s up, she returns to her bed. It's a secret she’s successfully kept for the last five years. But now someone knows. A week after her eighteenth birthday, when frustratingly handsome Caden Hawthorne captures her, delivers her to the government, and then disappears before her eyes, Ember realizes two things: One, she is not alone. And two, people like her—teleporters—are being used as weapons. Dragged off to a remote facility where others like her live, Ember’s forced to pair up with her former captor, Caden, to learn how to survive inside until she can escape. Only Caden’s making escape seem less and less appealing. But even as Ember falls for the boy who got her into this mess, she knows that she is running out of time. Because the government has plans for those like her, and those plans might just cost Ember her life.

When eighteen-year-old teleporter Ember Pierce wakes up in a Los Angeles hospital, she remembers only the she’s been trained by the government as a spy, she’s sent on dangerous missions, and her last assignment—the one that landed her in the hospital—was a setup. Caden Hawthorne has spent the past ten months of his life grieving Ember’s death. So when she shows up in his room like an apparition, he can’t believe his eyes. But this Ember is different. Her hair is longer, her skin is paler, her gaze is haunted. She tells him what he’s already begun to someone he trusted betrayed her. Now, uncertain who is friend and who is foe, Ember and Caden face the toughest mission of their lives—to stay together and survive, as they run from danger toward an unknown future.