More trouble at the Flying U Ranch! It began when Chip Bennett and Weary Davidson came upon some slaughtered cows, with their hindquarters skinned out. They realized beef rustlers were on the rampage. On their way back to report, a hidden rifleman tried to shoot them out of their saddles! Something more sinister than rustling was afoot! Chip soon discovers that his old enemy, Big Butch Lewis, is rounding up gunmen from all over Montana in a sweeping plan to make the range a stronghold for outlaws!