There was no reply, and without further ceremony I entered and searched the chambers. They were empty. Deeply mystified, I was about to go out again when there came a ring at the door-bell. I walked to the door and a policeman was standing upon the landing.

“Good evening, sir,” he said, and then paused, staring at me curiously.

“Good evening, constable,” I replied.

“You are not the gentleman who ran out awhile ago,” he said, a note of suspicion coming into his voice.

I handed him my card and explained what had occurred, then:

“It must have been Mr. Adderley I saw,” muttered the constable.

“You saw—when?”

“Just before you arrived, sir. He came racing out into St. James's Street and dashed off like a madman.”

“In which direction was he going?”

“Toward Pall Mall.”