Before he was killed by Mark Foster's men, Bud Lawton willed part ownership in his ranch to Hoppy and his two pals. When the three arrive they find a fake posing as Lawton. When they expose the imposter, Foster gets the Sheriff to jail them for Lawton's murder.
Acting
William Boyd's Hoppy: the original stoic cinnamon roll cowboy.
Direction
Archainbaud squeezes a full mystery into 65 minutes. Efficient king.
Costume
That all-black outfit? Hoppy understood branding before Instagram.

Director
George Archainbaud
Trivia, insights & behind the scenes
William Boyd played Hopalong Cassidy in 66 films from 1935-1948, making him one of Hollywood's most prolific franchise stars before franchises were even a thing.
This was the 38th Hoppy film—produced by Harry Sherman, who basically invented the B-Western assembly line.