For tribes of the American Southwest, the annual Sun Dance is among the most solemn and sacred of rituals. But lately Death has been an uninvited guest at the hallowed rite. Ute tribal policeman Charlie Moon is puzzled. The deceased Sun Dancers sustained no visible, life-ending injuries, so he is reluctant to call it murder -- though there is surely nothing natural about the sudden, inexplicable deaths of two strong and healthy men. Unlike...