In upstate Idaho, Ness Hook is run out of his mom's house by his bullying brother Shawn. In Redding, California, Tristan Carter is graduating college, but with no job and no prospects, she'll have to move back in with her parents.
Then the world ends: first with a virus, then with an alien invasion.
Ness and Shawn take to the mountains to fight a guerrilla war against the attackers. In California, Tristan and Alden are taken prisoner. Separated from her brother, Tristan crosses the ruins of America to track him down. She will stop at nothing to get Alden back--but her fellow survivors prove even more dangerous than the monsters who broke the world.