When Captain Neil, leading the Texas Rangers to wipe out cattle rustlers along the Mexican border, is ambushed and shot in the back, his best friend Steele vows to catch the killers alone. Traveling in disguise, Steele rescues Ray Longstreth, who is returning home from school in the East, from two Mexican renegades, and wins the gratitude of Ray's father Cyrus, a prominent rancher and secretly the leader of the rustlers. Although Longstreth wants to quit rustling because of his daughter's return, his subordinates, Jeff Lawson, who killed Neil, and Bully Brome, blackmail him into remaining. When Steele accepts Longstreth's offer of a job and discovers his involvement, he tells Ray, whose pleas provoke Steele's promise not to harm him. After Steele kills Brome and learns that Longstreth was forced to continue with the gang, he confronts Lawson--who, like Steele, loves Ray--kills him a duel, routs the gang, and leaves town with Ray as his wife.