The survivors of the Monument 14 have finally made it to the safety of a Canadian refugee camp, but Josie, trapped in a brutal prison camp for exposed Type Os, may lose hope unless Niko and his companions can rescue her.

Six high school kids, two eighth-graders, and six little kids trapped together in a chain superstore build a refuge for themselves inside. Outside, a series of escalating disasters, beginning with a monster hailstorm and ending with a chemical weapons spill, seem to be tearing the world -- as they know it -- apart.

After repairing a school bus, the group of survivors splits in two, with one group heading to the airport in hopes of reuniting with their parents and saving their dying friend and the other trying to rebuild the community they lost. A group of survivors, originally trapped together in a superstore by a series of escalating disasters, has split in two -- one group heading to Denver airport on a repaired school bus, the other remaining in the Sanctuary...