Wrongly assuming it is a spa weekend, Agatha attends a Special Paranormal Activity group at a forbidding castle, meeting local witch and clairvoyant Francie Juddle, whose tarot card reading foretells Death, though it is Francie who dies. Agatha discovers her murdered body clutching a card that reads Justice. Joined by her friends, Agatha sees this as a sign for her to solve the crime and questions the castle's staff and guests who had recently visited Francie. The dead woman's sister Janine, who also claims to be clairvoyant, holds a séance to unmask the killer, but only produces another corpse, and brings Agatha into conflict with investigating officer Inspector Jessop before she cracks the case and receives a surprise from James.