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A superior Hopalong Cassidy Western, The Leather Burners benefits from a good script by Joe Pagano. In trouble with a gang of cattle rustlers who have murdered his neighbor, former Bar 20 ranch hand Johnny Travers (Jay Kirby) sends for old friends Hopalong Cassidy (William Boyd) and California Carlson (Andy Clyde). Hopalong Cassidy immediately suspects mine company president Dan Slack (Victor Jory) to be behind the rustlings and decides to go undercover. As it turns out, the Slack mine is not what it appears to be and there is a traitor among the ranchers. But who? With the assistance of Sharon Longstreet (Shelley Spencer) and her young brother Bobby (Bobby Larson), who have discovered Hopalong Cassidy's real mission, the secret of the mine is revealed and peace is restored to the area.