When Lew Walters and his three henchmen kidnap Millie and her child, her brother Jim Carson sets out to find her. Now known as Jim Lassiter, he kills the three henchman. In Cottonwood County he joins up with rancher Jane Witherspoon in her fight against the rustling Riders of the Purple Sage. The crooked County Judge is Dyer, who unknown to Lassiter is really Lew Walters.