In two strangers wake after what appears to be several decades of slumber in a world they do not recognize and which they find utterly devoid of human life outside themselves. In this dystopian sci-fi sequel to garrulous hair-stylist Todd and reserved biologist Mort embark on a cross-country exploration of a post-apocalyptic world in a search for humanity, and discover their new world appears instead to be inhabited by creatures of long-ago eras-like woolly rhinos and dinosaurs-as well as futuristic periods-like flying boats and humanoids. Though Todd and Mort's increasingly perilous journey eventually ends with the discovery of a world in which they can live, their exploration is far from over; their new fate is a mission into the center of the Earth-or, rather, the edge of the universe-that none have previously survived. Taking place twenty-seven years after the portentous events of its acclaimed prequel, unites new characters with familiar faces in an unforgettable pursuit to better understand their new world and how to continue their species' existence within it.