The formidable Courteen family of ranchers, led by old man Brimstone (Walter Brennan), refuse to accept the end of the open range and wage war against homesteaders, nesters, squatters, and the like by robbing stagecoaches of loot being transported for the interlopers. Suddenly, a mysterious new bandit appears on the scene and begins robbing the robbers! Johnny Tremaine (Rod Cameron) strolls into town and teams up with the local sheriff (Forrest Tucker) to help get some control of the situation. In the process he becomes involved in a split within the Courteen family concerning the youngest son, Bud (James Brown), who is in love with a nester, Molly Bannister (Adrian Booth). Tremaine has quite a task in unraveling the twisted plot, but by the end of the show a satisfactory resolution takes place with a few surprises along the way.