Marguerite Harrison, Merian C. Cooper and Ernest B. Schoedsack travel through Asia Minor to reach a tribe of nomads in Iran known as the Bakhtiari. They follow the tribesmen on their 48-day trek across deserts, rivers and mountains to reach a summer pasture for their flocks. There are hardships and conquests for the 50,000 tribesmen leading their 500,000 animals across the treacherous land. First is fording the raging waters of the Karun River by floating on rafts buoyed by inflated goatskins. Back and forth they go in the frigid waters as some animals drown. Hardest of all is ascending an almost perpendicular mountain in bare feet only to face the even more towering Zardeh Kuh, covered with deep snow, pathless. Finally they descend into their destination — a fertile and grassy valley.