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.

Gripping and full of heart, this epic continuation of Jeff Giles' series - which already has rave reviews from New York Times bestselling authors Kami Garcia, Melissa de la Cruz, and Cassandra Clare, among others - will bring readers right to the edge of everything.