Harley Windslow never thought she'd live to see the end of the world-let alone survive it. One day, she's a stubborn college dropout just trying to make rent in a crumbling city. The next, demons pour through the cracks of reality, and humanity splinters into factions: those who serve, those who fight, and those who hide.
Captured during a demon raid, Harley expects death. What she doesn't expect is him. The Demon Prince whose power could crush her with a glance, but whose fascination with her burns even hotter than hellfire. Torn between hatred and desire, Harley is thrust into a war between realms where nothing is what it seems.
But the world's collapse hides a darker secret. A mysterious airborne sickness is spreading-infecting humans, awakening strange and terrifying supernatural abilities. Harley begins to change, her blood humming with dangerous new power that could save the world... or end it.
Now, Harley must decide where her heart-and her allegiance-truly lie: with the remnants of humanity or with the demon who might be her destiny.