Mac is the ultimate good girl. Until one day she gets into trouble and the only people she can call are her best friends: Jace, Dean, and Nico. The price for their help? To be theirs for the rest of the month. Anytime. Anywhere. She thinks this is just a game; once it’s finished, things will return to how they had always been. But Jace, Dean, and Nico? They were playing for keeps. End game: Forever.