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In one of his few surviving Westerns, silent screen cowboy hero Art Acord plays Bill Strong, a U.S. Marshal witnessing Red Hank (Cliff Lyons) and his gang rob the Bear Valley mail truck and take the guard, Jake Grant (Horace B. Carpenter), hostage. Impersonating a foppish Easterner, Strong ("the Arizona Kid") infiltrates the gang, who come to admire his abilities with a gun. The situation gets complicated, however, with the arrival of Mary Grant (Carol Lane, Jake's daughter, whom Strong has rescued from a runaway horse. Red orders Strong to bring Mary to an abandoned shack for a romantic encounter but the Arizona Kid instead enables Jake to escape. While the gang takes up the chase, the Kid arrives at the shack just in time to prevent Hank from molesting Mary. The villain is subdued and his henchmen are eventually picked up by Sheriff Morton (Bill Conant) and his posse.