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After several years of mediocre westerns, cowboy star Tom Keene finally managed to find a winning formula in his 1941-42 vehicles for Monogram. Lone Star Law Men stars Keene as a deputy US marshal, sworn to help his boss rout a gang of border outlaws. Our hero elects to go undercover by joining the crooks himself-an old ploy, but one that works beautifully here. For the rest of the film, Keene has quite a time staying on camera with such formidable scene-stealers as comic sidekick Frank Yaconelli and all-around heavy Charles King as competition. Like many Tom Keene oaters of the period, Lone Star Law Men gives over a goodly amount of screen time to moppet Sugar Dawn, whom Monogram was obviously grooming for bigger things (which never materialized).