A government agent investigates a ring that is smuggling Chinese aliens across the border from Mexico. His investigation takes him to the Grand Canyon. He finds a dazed girl wandering around who has become separated from her companions and is lost. He and the girl are soon found by her companions - the smuggling ring!
Tom Hardy (Tom Mix), a pony express rider, is carrying government gold in a coach to Wassatch accompanied by Alice Calhoun (Sharon Lynn) , the daughter of the US telegraph survey station. The gold is to pay for the US Telegraph Survey and it is to be delivered to the survey chief, Jim Calhoun (Thomas Lingham). The coach is attacked by bandits led by the Slade (Duke Lee) and Kane (Mark Hamilton).
The story is set in Africa, where a band of cowboys, headed by Mix, embark on a search for their missing employer. They are accompanied in this venture by the boss' daughter, played by Sally Blane (sister of actress Loretta Young).
