Old Los Angeles finds Bill Stockton leaving Missouri to join his brother Larry, and prospect for gold in California. Bill and his pal, Sam Bowie, arrive in the picturesque town of old Los Angeles in 1848, but find that the outlaws rule... attacking mines and trains, burning ranches, looting stores and killing those who oppose them. Bill learns that Larry has been murdered for the gold claim he had staked for them. He sets out to avenge his brother's death but runs into difficulty when Estelita Del Rey misleads him to protect her lawless lover, Johnny Morrell. Bill also suspects Luis Savarin, gambling house proprietor, and Marie Marlowe, an entertainer at Savarin's place.