Bar 20.

Hopalong Cassidy and his sidekicks California Carlson and Lin Bradley leave their Bar 20 ranch for a cattle buy from the Stevens spread. Along the way, they encounter Mrs. Stevens, her daughter Marie and ranch hand Mark Jackson, whose stagecoach has been robbed by the Quirt Rankin gang. Jackson, secretly the boss of Quirt's gang, tries to swindle Richard out of his land and lends him cash that was Hoppy's cattle money before the robbery. Hoppy mistakenly believes Richard to be the thief and takes back the money.