Things have changed for seventeen-year-old Zoe ever since the otherworldly events that brought her together with the mysterious bounty hunter she calls X. In order to save Zoe and her family, X has done the unthinkable - he's given up his freedom and returned to captivity in the Lowlands.

X is determined to break the lords' hold on him once and for all, but being stripped of his power pushes him toward a darkness he's never experienced and a past he's never known. The secrets that surface could be the key to reuniting X and Zoe... or they could mean the destruction of everything they have been fighting for.

For the perfect love, what would you be willing to lose?

It’s been a shattering year for seventeen-year-old Zoe, who’s still reeling from her father's shockingly sudden death in a caving accident and her neighbors’ mysterious disappearance from their own home. Then on a terrifying sub-zero, blizzardy night in Montana, she and her brother are brutally attacked in a cabin in the woods—only to be rescued by a mysterious bounty hunter they call X.

X is no ordinary bounty hunter. He is from a hell called the Lowlands, sent to claim the soul of Zoe’s evil attacker and others like him. X is forbidden from revealing himself to anyone other than his prey, but he casts aside the Lowlands’ rules for Zoe. As they learn more about their colliding worlds, they begin to question the past, their fate, and their future.