Jim Fallon is summoned to Rim Rock by Hugh Delaney, an uncle he has not seen in years. Delaney wants to inform Jim that he has located Jim's elderly father, Pop Fallon, who is blind, and that a young impostor who calls himself Jimmy Fallon has established himself as Pop's son. Pop owns a rich gold mine and is cared for by his housekeeper Martha. Jim's pal Johnny accompanies him to Rim Rock. Before they can hear Delaney's story, Delaney is badly wounded as he and two miner friends, Ed Roper and Shealey, hold up the stage and take a shipment of gold from the Fallon mine for the third time. In Rim Rock, neither Pop nor Martha believe Jim's story about Jimmy being an impostor. Jimmy is actually the son of Rim Rock storekeeper Pete Ingram who had waited for years to present Jimmy as Fallon's son and get control of Fallon's fortune.