Set in New Mexico and California, the novel features three teens who fall through a cave at Carlsbad Caverns in New Mexico while on a field trip. They are plunged into a frightening parallel universe—seven weeks in the past, in which their "normal" worlds of family and high school remain the same…except for the fact that no medicine exists and when people die in the street they are picked up and disposed of.

    Delta of Dead River has always been told to hide her back, where a map is branded on her skin to a rumored paradise called the Verdant. In a wasteland plagued by dust squalls, geomagnetic storms, and solar flares, many would kill for it—even if no one can read it. So when raiders sent by a man known as the General attack her village, Delta suspects he is searching for her.  Delta sets out to rescue her family but quickly learns that in the Wastes no one can be trusted—perhaps not even her childhood friend, Asher, who has been missing for nearly a decade. If Delta can trust Asher, she just might decode the map and trade evidence of the Verdant to the General for her family. What Delta doesn’t count on is what waits at the Verdant: a long-forgotten secret that will shake the foundation of her entire world.

    Most people don't know it's there. The caldera is so large that it can only be seen from a plane or satellite. It just could be overdue for an eruption, which would change the landscape and climate of our planet.For Alex, being left alone for the weekend means having the freedom to play computer games and hang out with his friends without hassle from his mother. Then the Yellowstone supervolcano erupts, plunging his hometown into a nightmare of darkness, ash, and violence. Alex begins a harrowing trek to search for his family and finds help in Darla, a travel partner he meets along the way. Together they must find the strength and skills to survive and outlast an epic disaster.