 Frontiersmen Boone and Jim Deakins join up with Boone s Uncle Zeb on a fur-trading expedition into the uncharted Blackfoot territory. The expedition s leader, the Frenchman Jourdonnais, has a plan for succeeding where no white man has traded before: he plans to return a kidnapped Blackfoot princess, Teal Eye, to her people and thus to win their gratitude and trade. Guided by Teal Eye and a crazy warrior named Poordevil, the trappers travel upriver, only to find their greatest obstacle is not Indians, but a ruthless pack of fur traders led by MacMasters and his henchman Streak. Along the way, Boone and Jim Deakins both fall under the spell of the beautiful Teal Eye, and their friendship begins to crack.