Zach Wade, a mischievious kid who - along with his younger sister Hannah and their devoted dog Chinook - become lost in the wilderness when their small plane has engine problems and must make an emergency landing. Their mom and dad are frantic and rescue teams are searching. But for the next few days, Zach, Hannah and Chinook must learn how to combine their skills, trust their instincts and navigate a terrain as beautiful as it is untamed.