"I quite understand that I will probably catch the Blue Disease," said Sir Robert, suavely. "At present there are cases reported all over London, and we are at a loss to know what to do." "You can do nothing," I said. "We had thought of forming isolation camps." He stared at us thoughtfully. There was a slightly puzzled look in his face. It was the first time I had noticed it. It must have been due to Sarakoff's profound calm. "How did you gentlemen find the germ?" he asked suddenly. Sarakoff reflected. "It would take perhaps a week to explain." Sir Robert smiled slightly. "I'm afraid I am too busy," he murmured. "You are wasting your time," muttered Alberan in his ear. "Arrest them." The Home Secretary took no notice. "It is curious that this epidemic seems to cut short other diseases," he said slowly. "That rather supports what you tell me." His eyes rested searchingly on my face. "You are foolish to refuse to believe us," I said. "We have told you the truth." "It would be very strange if it were true." He walked to the window and stood for a moment looking on to the street. Then he turned with a movement of resolution. "I will not trespass on your time," he said. "Lord Alberan, we need not stay. I am satisfied with what these gentlemen have said." He bowed to us and went to the door. Lord Alberan, very fierce and upright, followed him. The Home Secretary paused and looked back. The puzzled looked had returned to his face. "The matter is to be discussed in the House to-night," he said. "I think that it will be as well for you if I say nothing of what you have told me. People might be angry." We gazed at him unmoved. He took a sudden step towards us and held out his hands. "Come now, gentlemen, tell me the truth. You invented that story, didn't you?" Neither of us spoke. He looked appealingly at me, and with a laugh left the room. He turned, however, in a moment, and stood looking at me. "There is a meeting at the Queen's Hall to-night," he said slowly. "It is a medical conference on the Blue Disease. No doubt you know of it. I am going to ask you a question." He paused and smiled at Sarakoff. "Will you gentlemen make a statement before those doctors to-night?" "We intended to do so," said Sarakoff. "I am delighted to hear it," said the Home Secretary. "It is a great relief to me. They will know how best to deal with you. Good day." He left the room. I heard the front door close and then brisk footsteps passing the window on the pavement outside. "There's no doubt that they're both a little mad." Sir Robert's voice sounded for a moment, and then died away. CHAPTER XVII CLUTTERBUCK'S ODD BEHAVIOUR Scarcely had the Home Secretary departed when my maid announced that a patient was waiting to see me in my study. I left Sarakoff sitting tranquilly in the waiting-room and entered the study. A grave, precise, clean-shaven man was standing by the window. He turned as I entered. It was Mr. Clutterbuck.