J. Dennis O'Moore (Mickey Rooney) is on a train trip out West to visit his brother Patrick (Robert Stack). While on the train, he meets Texas Ranger Joe Walter (Robert Preston) who informs him that his brother is a wanted outlaw and that he is assigned to track him down. At first, Dennis refuses to believe the ranger but, when evidence proves the claims against his brother, he decides to track down Patrick himself and bring him to justice.