Billy Dickens discovers that his mysterious father lives in Montana, so this summer Billy will fly across the country, hike a mountain, float a river, dodge a grizzly bear, shoot down a spy drone, and save his own father.

"For 400 years, Earth has been a barren wasteland. The few humans that survive scrape together an existence in the cruel city of Pocatel -- or go it alone in the wilderness beyond, filled with wandering spirits and wyrms. They don't last long. 13 year-old pickpocket Leandro and his sister Gabi do what they can to forge a life in Pocatel. The city does not take kindly to Cascabel like them -- the descendants of those who worked the San Joaquin Valley...