When Jack Fielding, owner of the JF Ranch, found old Mark Severn, dying from a bullet wound, he knew there was going to be trouble on the Chuckwalla Range. As he lay dying, Mark made two requests: that Jack take over operation of the Bar 7, and that Jack find Mary Cameron, the granddaughter Mark had never met -- and turn over his empire to her. Word gets out that Mark has died and left his spread to an unknown granddaughter setting the stage for crooks,...

Allan Rand, looking for the missing heiress of a cattleman's fortune, rescues Poco Gato from cowboys set on a lynching. With Poco as a friend who would die for him, Rand sets out on a double quest through the rough and tough Roaring River district to stop the rustlers and to find the girl.