After being rescued from a brutal band of marauders, Ellen Hale rebuilt her life in the fortified neighborhood that became her home. A heartbreaking decision and devastating loss pushed her to become a fierce fighter, because weakness only got you and those you loved killed. Now her community is facing a deadly threat, and Ellen has another choice to make. Ellen volunteers as a member of fallback team three, tasked with establishing a temporary refuge for their citizens in the event their community is overrun by the enemy. As the danger intensifies, she and her adopted sister, Melissa, set off with the rest of their team on the road trip from hell. Their mission is cloaked in secrecy, but suspicions of a traitor arise. Something is affecting the zombies' migration patterns, and when blacksmith Tyler Garrett is discovered trapped in a farmhouse, the team refuses to trust him. But Ellen believes his story, and it's not just because of his rugged, blond good looks and soft-spoken manner-his skills can greatly benefit their team. As the team struggles to reach the fallback, previously secure locations are overrun, and their chances of success seem remote. With the likelihood of a traitor nearly certain, and the lives of everyone she loves at risk, Ellen must figure out who to trust before the traitor-or the zombies-destroy them all. Is there a spy among the fallback team, or is there another threat lurking in the Kentucky hills?