Synopsis by Hans J. Wollstein
Clark Stuart (Ray Corrigan) rescues the governor's coach in his usual spectacular manner and His Excellency (Gordon DeMain) promises to sign the trade agreement with the United States as soon as the villainous lieutenant governor, Dupray (LeRoy Mason), and his renegades have been captured. In his secret mountain hideaway, Dupray is plotting how to steal the governmental seal that will restore him to power in Santa Fe, unaware that the Rider (Julia Thayer) is watching the entrance to the cave. Alerted by one of her whistling arrows, the wagon train crew catches Topek (Greg Whitespear) and Zamorro (Duncan Renaldo) in the process of breaking into the governor's office but the latter manages to escape. Stuart takes up the chase but walks right into one of Dupray's fiendish traps.