In a sheltered basin, high up in Colorado's remote Rocky Mountains, two field collectors discover an awesome array of dinosaur bones. Knowing that two competing and irreconcilably hostile palaeontologists will pay big money for knowledge of such a find, the men realise that they have struck bone treasure. Unfortunately for all concerned, a supposedly extinct race of Anasazi Indians regard these relics as sacred and are prepared to slaughter anyone who tries to remove them.Only one of the men makes it back to Denver, his hair turned prematurely white by his horrifying experiences, but what he brings with him touches off an unstoppable chain of events. Joe Eagle, a frontiersman desperately in need of money, agrees to lead a large party into the Rockies to plunder the fossil beds, but word of the find has got around and their ruthless competitors are never far away. And, somewhere up ahead, the terrifying Anasazi await them all...