Decades after the apocalypse there is a new threat to the survivors, and Ashley can't convince anyone to take it seriously. Even her father, the great Robby Pierce, can't be swayed. Her only recourse is to go off on her own to discover the nature of the approaching calamity. Meanwhile, the settlements are dealing with more immediate problems. The basic laws of physics are breaking down. They're racing against a disaster that everybody can sense and nobody can predict. Intuition tells them to hide from the skies, but other monsters live beneath the ground. Join Robby, Brad, Romie, and Lisa as they struggle to save the community that they worked so hard to establish. Join them and see if they survive.