Justin MacArthur hopes to impress his ninth grade classmates with his outdoor skills on a long-anticipated school field trip to the famous YO Ranch in south Texas. Reserved and self-conscious at school, Justin's expert horsemanship and knowledge of the outdoors—skills he learned from his father, a Texas Parks and Wildlife game warden—provide an opportunity to improve his status as a fringe member of the cool group. But a secretive Korean boy with a chip on his shoulder and a terrifying thunderstorm during a trail ride undermine Justin's well-laid plans and change his life in ways he never imagined.