 Every previous shipment of silver bullion from the "Mina de Plata de la Compania Valdez" has been held up by a mysterious bandit known as the Masked Rider, despite the best efforts of mine owner Don Sebastian Valdez (Guy D Ennery) and his foreman Douglas (Grant Withers). Jean Malone (Nell O Day), whose late father was the Don s partner, and Margarita Valdez (Virginia Carroll), the Don s daughter, ask Larry Prescott (Johnny Mack Brown) and his sidekick, Patches McQuilt (Fuzzy Knight), for their help in putting an end to the raids of the Masked Rider and his gang.