The steep ochre cliffs and hot barren mesas of the vast Navajo Indian Reservation in the American Southwest harbor dark mysteries only the local inhabitants understand. Following the death of his wife and son during childbirth JOHN ROUNDTREE has become a bitter recluse, seldom seen outside his neglected house during the day. Rumors of strange figures seen in the dark of night convince the townsfolk that Roundtree is practicing the dark arts. So when hunting guide EAGLE FEATHER and his two clients stumble across the broken body of a little white girl on a lonely mesa top the people naturally suspect Roundtree. The authorities send for FBI Agent ZACK TOLLIVER to assist in the investigation. The young victim has been clawed and there are bear tracks nearby. But when Zack and Eagle Feather follow the tracks they mysteriously change mid-stride to barefoot human prints. Zack tracks the killer on horseback deep into the wild desolate countryside and encounters a terrifying presence during the night. His trail leads him to Roundtree's house and a confrontation with the recluse and finally the case is solved...or is it? Months later another little girl's body is found 500 miles away in southern California. Are the cases connected? And if so, who or what is doing all this, anyway? Some evil force is at play.