The stagecoaches on the line owned by Colonel Parker are being robbed and the drivers killed, so The Duchess sends for Red Ryder. Businessman Ernest Murphy and his gang of outlaws that include the whistling Chopin, gets hold of the letter that the Duchess wrote Red and hires the Idaho Kid to waylay him. But Red gets the drop on Idaho instead, and then poses as him and joins the gang. Murphy, realizing that Red isn't the man he hired, frames Red for stealing an ore shipment. Little Beaver helps Red escape from the Sheriff and his posse, and they set about to track down the gang.