All the Bar-20 cowhands gather to aid one of the former Bar-20 riders who is systematically being rustled of his cattle herd by a gang of rustlers operating out of the Black Buttes. "Hopalong" Cassidys plan is for him and grizzled "California" Carlson to work their way into the gang, while their young sidekick, Johnny Nelson---sorry, "Lucky" isn't in this 'un---assembles the others at the ranch and awaits a smoke signal from Cassidy to attack the bandit stronghold.
—Les Adams <longhorn1939@suddenlink.net>