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Postal inspector Rex Allen rides hell bent for leather in order to save an innocent man from hanging in this enjoyable Western from Republic Pictures. When Allen suggests shipping the mail from San Francisco to San Diego via stagecoach instead of clipper ship, Roger McCall (Grant Withers), the crooked owner of the shipping line, does his utmost to prevent stage line operator Sam Sawyer (Forrest Taylor) from winning the contract, including having him falsely accused of murdering a longtime rival (George H. Lloyd). Rex, however, suspects that First Mate Orrin (Roy Barcroft) is the real culprit, but will he be too late to see justice done?