On the night of Christmas 1998, a homeless man enters the infamous Greyfriars Kirkyard in Edinburgh. Seeking refuge, he broke into the tomb of George Mackenzie — Edinburgh's famous executioner — then fell into an assembly of decomposing corpses. His screams were heard above ground, but something else had been disturbed. Within weeks, stories of blackouts and inexplicable attacks began to spread. The injuries were so severe that Edinburgh City Council locked the gates and declared the area out of bounds for public safety. Jan Andrew Henderson began to chronicle the Mackenzie Poltergeist — only to claim to become a target of its malice.