When oil is discovered on a Vegas ranch, Mexican gambler Carlos is in a deadly fight with his enemies for the oil, putting his girlfriend (Dale Evans) at risk as well as his female cousin whom the bad guys shoot in the arm. His girlfriend then masquerades as his wounded cousin, but cowboy hero and oil prospector, Roy Rogers catches wind of the plot and begins a rescue mission for Dale. Eventually, a tense gun battle and fist fight ensue to bring justice.
