““Luke came, hesitated in the cold spot, and then moved quickly to get out of it, and Eleanor, following, felt with incredulity the piercing cold that struck her between one step and the next; it was like passing through a wall of ice, she thought, and asked the doctor, “What is it?” The doctor was patting his hands together with delight. “You can keep your Turkish corners, my boy,” he said. He reached out a hand and held it carefully over the location of the cold. “They cannot explain this,” he said. “The very essence of the tomb, as Theodora points out. The cold spot in Borley Rectory only dropped eleven degrees,” he went on complacently. “This, I should think, is considerably colder. The heart of the house.””