The Shoshone string up a Pawnee warrior to die. The train finds the warrior and discovers that he's the long-lost son of Spanish aristocrats... and the Shoshone won't stop until he's dead.

After his parents are killed by white men, a boy is raised by a lone Indian. Years later when the wagon train stops nearby, the Indian tells the young man to join his people. But his previous experience with the train make him hesitate.