Plot Summary:Crooked politician Gus Sloan (George Eldridge) , along with dry-goods store owner John Rogers (Henry Roquemore) and their henchmen are trying to grab up all the ranches in San Joaquin valley and blame their deeds on the A&M Railraod Company. After Sloan has acquired all the property, he plans to sell it at a high profit to an eastern syndicate for railroad right-of-way. Cattleman Jim Blake (Joseph Bernard), opposing Sloan, is murdered by crooked deputy Tanner (Carl Sepulveda), on Sloan's orders. Gil Blake (Tex Ritter), the murdered man's son, exacts revenge as he and his cowhands, Jimmy (Jimmy Wakely, Johnny (Johnnny Bond) and Scotty (Scotty Harrell), become fugitives by doing their best to help the lone rancher hold-out, Boduine Carter (Henry Hall) and his daughter Jane (Jennifer Holt). Enter "Rocky" Morgan, actually the son of the railroad owner, working undercover, and aids Gil and the Carters in there fight as the mysterious Black Rider. However, in doing so, to gain Sloan's trust...
The railroad is coming and two local business men are after the deeds to the ranches needed for the right-of-way. The Railroad Company sends Rocky to investigate the trouble and he finds Gus Sloan has deeds obtainded at the point of a gun. So Rocky robs Sloan to get the deeds. But he must now find Sloan's partner and figure out why the deeds are not signed by the new owners.