Luke has been hired by an industry baron to find his nephew, who was apparently kidnapped by the Blue-Feet tribe as a baby. In the snow-covered forests of Minnesota, the lonesome cowboy finds the child, Red Cloud, now 10 and the adopted son of the chief. But Luke quickly realises that all his employer wants is to get rid of a rival to the family fortune. He has no choice but to take his new charge north, to Canada and safety...