AllMovie

Brass Knuckles opens with a prison break, which is quelled by good-natured convict Monte Blue. As a reward, Blue is pardoned, whereupon he honors a promise made behind bars and visits orphanage resident Betty Bronson, the daughter of a condemned prisoner. Assuming that the girl is a mere adolescent, our hero is pleasantly surprised to discover that Bronson is a fully-grown young lady. He isn't so keen on Bronson escaping the orphan asylum and tagging along with him, but what can one do? The plot takes a sinister turn when escaped con William Russell shows up, claiming to be Bronson's late father. Blue gets there just in time to prevent the heroine from being raped, whereupon he realizes that he's been in love with her all along. Monte Blue is well served by the formula-bound screenplay, but Betty Bronson's unique talents are wasted once more.