In a world where humans are unaware of the demons that roam amongst them, it's left to the Nephilim to keep it that way—or at least that's what Grace Campbell was brought up to believe. Grace might have been born half-Nephilim and half-demon, but her loyalty is wholly on the side of the good guys. She's dedicated her life to protecting the innocent, and her mixed linage only makes her better at her job. Unfortunately, her blood also makes her the only one capable of entering Hell's hidden wards.

Now her latest assignment will see Grace endure the trials of the seven deadly sins in order to win a barbaric tournament to secure an important prize for the Nephilim. To survive, Grace will be forced to embrace her dark side and accept the help of her greatest opponent yet, Lucifer's son. The very sexy Prince of Hell, Zadeon, will have Grace questioning just how bad, the bad guys are.