Youngman Duran, a deputy on a Hopi Indian reservation in New Mexico, begins to investigate a series of mysterious cattle mutilations. Abner Tasupi, an ancient and embittered medicine man who raised Youngman after his parents died, tells him he has cast a spell to end the world that very night, but Youngman assumes he simply is babbling while under the influence of datura root. The following morning, Youngman finds Abner's bloodless body on the floor of his shack, and nearby he discovers a dead shepherd and most of his flock.