Rancher Joe Cumberland finds "Whistling Dan" in the desert and gives the boy a home, rearing him with his daughter Kate. Dan, grown to manhood, remains untamed, possessing a hot temper which ignites his eyes into a yellow glow when he is angered. Dan's eyes glow and he vows revenge when outlaw Jim Silent tries to kill him in a saloon brawl. Kate goes to the outlaw camp to prevent Dan from killing Silent, but is taken prisoner. The confrontation between the two men escalates when Dan captures Lee Haines, one of Silent's men, and Silent retaliates by imprisoning Kate's father. After a trade of prisoners, Dan trails the outlaws and exterminates the entire gang except for Silent. The two adversaries then slug it out, with Dan strangling his tormentor. His revenge accomplished, Dan is somewhat tamed and settles down with Kate.
—AFI