"About the young gentleman, Sir Thomas, the young gentleman who has come to stay for a time. Your instructions were that he should be wakened and told to come to Fleet Street without the least delay. You also said a taxicab would be waiting for him, by the time he was dressed, to drive him down."

"And he went?"

"Certainly, Sir Thomas, he was in his clothes quicker than I ever see a gentleman dress before, had a glass of milk and a biscuit, and the cab was just coming as I went down with him and opened the front door."

I rushed out of the room, down the corridor and into that which had been placed at Rolston's disposal. It was as Preston said, the lad was gone. The bed was tumbled as he had left it, but a portmanteau full of clothes, some hair brushes and a tooth brush on the wash-stand remained. Clearly Rolston believed he was obeying orders.

Preston had followed me out of the smoking-room and stood at the door, a picture of uneasy wonder. Let me say at once that Preston had been with me for six years, and was under-butler at my father's house for I don't know how many more. He is the most faithful and devoted creature on earth and, what is more, as sharp as a needle. He, at any rate, had no hand in this business.

"There's something extraordinarily queer about this," I said. "I assure you that I have never been near the telephone during the whole night. I dined with Lord Arthur in Soho and the rest of the evening I have been spending at the Ritz Hotel with Mr. Gideon Morse. You've been tricked, Preston."

"I'm extremely sorry, Sir Thomas," he was beginning when I cut him short.

"It's not in the least your fault, but are you certain the voice was mine?"

He frowned with the effort at recollection.

"Well, Sir Thomas," he said, "if you hadn't told me what you have, I believe I could almost have sworn to it. Of course, voices are altered on the telephone, to some extent, but it's extraordinary how they do, in the main, keep their individual character."