The Blessing Way by Tony Hillerman

Joe Leaphorn must stalk a supernatural killer known as the "Wolf-Witch" along a chilling trail of mysticism and murder. When Lt. Joe Leaphorn of The Navaho Tribal Police discovers a corpse with a mouth full of sand at a crime scene seemingly without tracks or clues, he is ready to suspect a supernatural killer. Blood on the rocks . . . A body on the high mesa . . . Leaphorn must stalk the Wolf-Witch along a chilling trail between mysticism and murder. -