After fourteen-year-old Andy slips away from his kayaking group to visit the wilderness site of his archaeologist father's death, a storm strands him on Admiralty Island, Alaska, where he manages to survive, encounters unexpected animal and human inhabitants, and looks for traces of the earliest prehistoric immigrants to America.

Fifteen-year-old Jessie and the other rebellious teenage members of a wilderness survival school team abandon their adult leader, hijack his boats, and try to run the dangerous white water at the bottom of the Grand Canyon.