Released from a navy hospital following WW II, Lon Evans learns that he faces eventual blindness and returns to his Wyoming ranch. He sees a beautiful white stallion named Starlight and his cowhands Lem and Yancy say he is a killer and cannot be trained. Lon disproves this by training the stallion to act as his guide in preparation for his future blindness.

Johnny Riggs, a con man on the lam, finds himself in a Latin-American country named Patria. There, he overhears a convent-bred rich girl praying to her guardian angel for help in managing her tangled business affairs. Riggs decides to materialize as the girl's "angel", gains her unquestioning confidence, and helps himself to the deluded girl's millions. Just as he and his partner are about to flee Patria with their booty, Riggs realizes he has fallen in love with the girl and returns the money, together with a note that is part confession and part love letter. But the larcenous duo's escape from Patria turns out to be more difficult than they could ever have imagined.