Bound to steal her queen magical bones, thief Lynne knows only one mistake equals death. And yet, she dreams of living in the forbidden world upon the surface, hating every minute in the Underworld. When she secretly develops a crush on a human, she loses a bone in his realm and has no choice but to strike a deal with the only one who could help-an evil witch. To save her life, she must earn the man's love and bring back the bone in 99 days.

Rio Renero is a notorious gang leader in Chicago and his life has been set to one purpose-to get back at his enemies. With a mysterious, beautiful girl showing up on his doorstep, he sees the solution to his machinations. She offers him a chance at a deadly heist that could destroy all his enemies. In return, he must help her steal a book. What a cinch.

As Lynne and Rio dig deep into a dark net of politics, magic and passion, they need to learn to trust each other.