Mary kept back her tears. She would have felt better if she could have seen even the slightest trace of remorse in her brother. "Marry Berrington," he said. "He has been pretty faithful to you and you will be alone in the world now. You should think yourself lucky with a man like that to fall back upon. I have to say adieu to the lot of you." Sartoris was gone at last. In fact the whole lot were packed on the motor car which the police had sent down at Field's instigation. Being a cripple, Sartoris had been accommodated in the seat by the driver. With her eyes heavy with tears, Mary watched them depart. Sartoris was fatally correct in his prophecy; it was the last time that Mary was destined to see him. He had always recognised the fact that jail would be the death of him. He had the germs of a disease in his breast that he had only kept at bay by constant occupation and mental activity. Mary never looked upon the face of her brother in the flesh again. Field turned to Berrington and drew a long breath. "The atmosphere smells all the sweeter for the loss of that lot," he said. "My word, this has been an anxious night for me. I don't know when I have felt so nervous. But I see that you have made a discovery, Colonel Berrington. What is it?" "It seems to me that I have made more than one," Berrington said. "In the first place my suspicion that the body of Sir Charles Darryll was brought here has been confirmed. To begin with, I have got to the bottom of that mysterious dining-room business. Come this way and I will show you. Bentwood and that officer of yours had better stay here for the moment." "Anything that I can do for you, gentlemen," Bentwood said meekly. "Any information that lies in my power. You have only to command me, and I will respond." "Presently," Field said contemptuously. "We will question you later on. Then you shall tell me all about that secret Eastern drug that you understand so well, and what effect it is likely to have on a sleeping man." Bentwood gave a gasp, and his face grew livid. It was evident that Field had struck and tapped a mine that the doctor had considered to be hidden from everybody. Then Bentwood sat down moodily and looked into the fire. Berrington led the way into the dining-room, where he proceeded to explain everything in relation to the room under the floor and the vault in connection therewith. Field was particularly interested. All this worked out beautifully with his theory. "I expect the body was concealed here," he said. "The thing has been well worked out. But do you suppose that Sartoris went to all this trouble and expense for the simple reason----"