When you've lost everything, what's worth fighting for? Beneath the glittering stars of Pennsylvania's Dark Skies, people are few and zombies fewer. Imogen's faith in humanity-normally abundant-is shaken by the suspicion that a fellow survivor sabotaged their escape from the zoo, forcing her to leave her Iberian lynxes behind. Reeling from his failure to save his sisters and girlfriend, Mike does what he always has: step up. Protecting everyone is easier said than done, however. Some people care only about themselves, and fractured by in-fighting, factions are forming. As a threat beyond their isolated sanctuary closes in, the divided group must unite. If they can't, the greatest danger they face might not be zombies but each other.