This belongs to the perish-and-publish television school of fiction courtesy of BBC--better done than many since Nation strings words as well as episodes together with ease. A universicidal virus, sort of like the Black Death, takes care of most of the people in the world but a few survive, not so much to start over again as to use what's left over (stockpiles of food and clothes) and live in small clusters. They must defend themselves against looters and scavengers and killers; they farm and trade; and finally they look toward a more creative existence, exiting from England overseas. Here's the surprise clincher and it deals with the one character who can be said to be a character--Abby who has always been looking for her son who just might still be alive. . . . Nation is highly experienced in series scenarios and even if you won't hang from cliff to cliff, you'll read from page to page.