Plot

In the cattle town of Lost Valley, Buck Courtrey, saloon owner and political boss, covets Tharon, daughter of Jim Last, a small rancher; and when rebuffed, he has Last killed. Tharon swears revenge with her father's own guns and organizes a vigilante band to check Courtrey's activities. Learning that she loves Billy, a cowpuncher, Courtrey kidnaps and threatens to kill him unless Tharon agrees to marry Courtrey following his divorce from Ellen. Courtrey's wife informs Tharon of Billy's whereabouts, and she rescues him in time to join the townspeople attacking Courtrey's gang. Courtrey is pursued by Tharon, who kills him and returns to become Billy's wife.—Pamela Short

Buck Courtrey is the boss of Lost Valley, in cattle country. Courtrey, though married, has eyes for Tharon Last, daughter of rancher Jim Last. After Courtrey accosts Tharon on the range, she threatens to tell her father. Instead, Courtrey ambushes Last and shoots him in the back. As Last dies in his daughter's arms, Tharon vows to avenge his death. She challenges Courtrey to a draw, but he refuses and she weakens. Then Courtrey steals her cattle and attacks her friends. Tharon takes her father's place as leader of the ranchers, and organizes a committee which vows to stop Courtrey's activities. Courtrey, through his wife, learns that Tharon loves Billy, one of her ranch hands.

Tharon leads a raid which recovers some of the stolen cattle. In an ensuing battle, Billy is wounded and taken by Courtrey. Courtrey sends word to Tharon that unless she agrees to marry him, Billy will be tortured to death. Courtrey's wife tells Tharon where Billy is hidden. She sets out to rescue him, along with an Indian guide. Meanwhile, Courtrey obtains a divorce from his wife, who dies of heart failure. Her brother attempts to kill Courtrey, but is himself killed. The townspeople finally turn on Courtrey and his men, but the villains manage to escape. Tharon rescues Billy and arrives back in town just as Courtrey and his men are returning to clean out the place. Courtrey is driven out of town, with Tharon in pursuit. She overtakes him and exacts her revenge, then rides back to town to marry Billy.