Greyfriar's Cemetery in Edinburgh has a centuries-old reputation for being haunted. Its gruesome history includes witchcraft, body-snatching, desecration, corpse dumping, and live burial. In 1998, something new and inexplicable began occurring in the graveyard. Visitors encountered "cold spots," strange smells, and banging noises. They found themselves overcome by nausea, or cut and bruised by something they couldn't see. Over a period of two years,...