 The United States Constitution is stolen by a revolutionary and agents James West and Artemus Gordon are sent by the government to recover it. Arriving at a Mexican border town, the agents penetrate an installation under a fortress to find the priceless document. When the agents find the revolutionary, he demands one million dollars for what is later discovered to be a forgery of the Constitution. Before forcing the revolutionary into a pool of acid, they are told a riddle that leads them to the hiding place of the real document.