Louise Boni, maverick chief inspector with the Black Forest crime squad, is struggling with her demons. Divorced at forty-two, she is haunted by the shadows of the past. Dreading yet another a dreary winter weekend alone, she receives a call from the departmental chief which signals the strangest assignment of her career - to trail a Japanese monk wandering through the snowy wasteland to the east of Freiburg, By the time she catches up with him, she discovers he is fleeing some unknown evil.