The world is in chaos; people struggle to survive in vaults underground as a deadly plague ravages earth. But there are others who walk the now barren world, others like Cam Morrington. Unaware of this, Cam struggles to survive in a world where he believes he is alone. Sisters Helena and Hayleigh Averdy find their selves in the same situation when they escape from the hell they know as the Vaults. Little do they know, life aboveground may be even worse than life below. This is the story of these people, the world, and the end of life as we knew it.