For centuries, angels have been guarding us, and demons have been causing havoc in Hell, trying to escape the wrath of the angels that capture them. Or so we've been taught. Nicolas is an angel, yet he enjoys nothing more than taking pleasure from other people's pain. The sight of human blood bodies scattered across the ground and the metallic smell that hangs in the air is all that he needs to feel in control. Lilyth is a demon, the Embodiment of the Seven Deadly Sins. She's killed, lied, stolen and tortured, but that's all a part of her job. So when she's sent to earth to take down what she thinks is a Rogue demon, she has no idea that what she is really about to encounter is a celestial being that would like nothing more to see her head on a plate.

Lilyth can see what Nicolas is: a cold-blooded killer. But he can see what lies beneath her regretful, duty-bound appearance: a strong and silent assassin. As war erupts, they realise that together, they could take down entire armies, create an unstoppable force greater than that of the archangels. But they know whose side they're on, and they know that people like them will never be able to win...