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.