Callypso Lillis is a siren with a very big problem, one that stretches up her arm and far into her past. For the last seven years she's been collecting a bracelet of black beads up her wrist, magical IOUs for favors she's received. Only death or repayment will fulfill the obligations. Only then will the beads disappear. Everyone knows that if you need a favor, you go to the Bargainer to make it happen. He's a man who can get you anything you want...at a price. And everyone knows that sooner or later he always collects. But for one client, he's never asked for repayment. Not until now.
Each night after Ember Pierce falls asleep, she disappears. She can teleport anywhere in the world: London, Paris, her crush's bedroom, or 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.
When eighteen-year-old teleporter Ember Pierce wakes up in a Los Angeles hospital, she remembers only the basics: 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.