Mac is the ultimate good girl. Until one day she gets into trouble and the only people she can call are her best 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 Forever.