With winter over, no one is safe. The infected rise from hibernation, hungry for survivors. While across the bay, an enemy's army waits to strike.

Shelby creates a new life as a runner. With the freedom to move and the chance to reinvent herself, she pays the high price of leaving loved ones behind. Tangled in a web of allies and enemies, Shelby embarks on a risky journey to secure her future.

A secret shatters Dean. After broken promises and torn relationships, he ventures out on his own. His plan to lay low is derailed when he runs into his wife—someone he vowed to stay away from. Could Shelby ever understand the blood on his hands and what he's had to do for his people? If not, he'll lose her and his new alliance.