 Assuming the identity of a Ranger he finds dying on the trail, Jack Rankin (Jack Randall), aided by his sidekick Manny (Ernie Adams),begins to clean up the lawless town of Brimstone, which is being preyed upon by outlaws robbing the nearby gold mines of the bullion shipments, secretly led by Frank Mason (Tom London) and his chief henchman Trigger (Charles King) . He is uncovered by the arrival of the dead man s sister, Marian Adams (Margaret Roach, in one of the few films she made away from her father s studio) and is accused of killing the Ranger.