Five years ago, they walked across America to a destination only they knew. The sleepwalkers, as the rest of the country named them, were followed by their shepherds: friends and family who gave up everything to protect them. They finally stopped in Ouray, a small town of Colorado that would become one of the last outposts of human civilisation. Because the sleepwalking epidemic was just the first in a chain of events that led to the end of the world - and the birth of a new one.