Longley and Captain Acosta of the Mexican Rurales travel to San Tomás to bid on a shipment of rifles and ammunition being sold at auction. Their efforts are in vain - to their surprise, they are outbid by a beautiful blonde woman. They learn that she's merely the front for a notorious gun runner who plans to sell the guns along the border where they'll soon fall into the hands of the Apaches. Longley and Acosta throw in together to prevent the gunrunners' plans from coming to fruition.
—David Bassler