Fourteen-year-old Chase lives with his mother, stepfather, and two siblings in the high country of Arizona, where they rent cabins and run a convenience store both tourist-driven business that aren t doing very well. The family is considering a move back to Phoenix, where Chase s father lives and there are better opportunities both for parents and children. Chase loves the high country and doesn t want to leave. In particular, he loves geocaching, a sort of a treasure hunting game involving a GPS. While on a geocaching expedition, he encounters two young brothers, camping in the wilderness with their father. Something s not right; that much he can tell. He s curious enough to return repeatedly, to figure out what s going on and how he can help. Ultimately he learns that the brothers have been kidnapped by their father from their mother, who has custody. Just as Chase s family is trying to decide what to do with their future, he has to decide what role he s going to play in Jack and Sam s life.