In 1832, life in the Rocky Mountains was filled with danger and mystery. Indian legends held that deep in secluded valleys lurked bizarre creatures bent on destroying man. Although Indians shunned such places, courageous settlers like Nathaniel King had no time for such tales, and they willingly braved these forbidden areas. But when Nate led a hunting expedition into a valley where one of these monsters was said to live, several of his fellow hunters were viciously slain. And before long Nate himself became prey of a beast that might have come out of his worst nightmare.