Ned Marriner is in France with his father, a celebrated photographer shooting the Saint-Sauveur Cathedral of Aix-en-Provence. While exploring the cathedral, Ned meets Kate, an American exchange student with a deep knowledge of the area’s history. But even Kate is at a loss when she and Ned surprise a scar-faced stranger, wearing a leather jacket and carrying a knife. “I think you ought to go now,” he tells them. “You have blundered into a corner of a very old story...” In this ancient place, where the borders between the living and the long-dead are thin, Ned and his family are about to be drawn into a haunted story, as mythic figures from conflicts of long ago erupt into the present, changing—and claiming—lives.