As the last man on Earth and his companions continue to head west, the story takes a detour into the psychological.
In the care of a fellow Culper Ring member, Yorick Brown is forced to confront his tremendous survivor guilt, which leads him to constantly put his life in danger. Once on the road again, the group runs up against a literal roadblock in Arizona, where the female remnants of the Sons of Arizona militia have cut the interstate to keep out any vestiges of the U.S. government.