A gang of highway robbers steal a ten thousand dollar bankroll from Paul Smith, nephew of government agent Lightning Bill Carson. With Smith's partner shot dead, and Paul nowhere to be found, the bandits convince a local judge that Smith himself committed the heist and the murder. Carson is called in to investigate, but realizing that the real culprits will be expecting him, he dons an elaborate disguise, making his presence known about town as a Mexican gambler named Jose. Undercover, Carson gains both the outlaws' trust, and access to the stolen money. Convinced he can catch the thieves in the act of committing another robbery, Carson's plan to bring the culprits to justice is jeopardized when one of the villains begins to suspect Jose's true identity.
Tim McCoy was already an authentic rodeo rider, a sharpshooter, and a Wyoming Indian agent when he was asked to provide American Indian extras for 1923's The Covered Wagon. With his foot in the door, McCoy went on to star in scores of cowboy pictures for a number of studios, including a notable stint opposite Buck Jones in Monogram's Rough Riders series.