In their third and final "Trail Blazers" Western together, Ken Maynard, Hoot Gibson and Bob Steele witness what appears to be a gang of Indians raiding a stagecoach. Investigating, the three lawmen discover that the attackers are actually white bandits dressed as Indians and that their leader is one Polini (Ian Keith), a gangster smuggling diamonds in the axle grease of the stagecoach wheels. Aided by young Donny Davis (Don Stewart) and pert Ruth Hampton (Myrna Dell), the "Trail Blazers" survive several clashes with death -- including being trapped inside a cave -- before Polini and his cohort, Banker Steve Lynch (Karl Hackett), are apprehended. In only her second Western, blonde heroine Myrna Dell was not exactly in awe of her veteran leading men who, as she later recalled were "old enough to be my grandfather!" Maynard, in fact, had come to the end of his long starring career. Unable to get along with his more athletic co-star Bob Steele, the often cantankerous left the series and only returned to films in rare cameo appearances. His place in the final two "Trail Blazers" Westerns was taken by Chief Thundercloud.
~ Hans J. Wollstein, All Movie Guide