A sudden thought struck him. He put on his fur coat and hat and went out into the hall. There he paused, hearing the slow heavy tread of the policeman on the pavement outside and seeing the flash of the bull’s-eye reflected in the window. He waited and held his breath.

After a few moments he drew back the latch and slipped out, shutting the door very gently behind him. Then he began ringing the bell. In about five minutes his valet appeared, half-dressed and looking very drowsy.

“I am sorry to have had to wake you up, Francis,” he said, stepping in; “but I had forgotten my latch-key. What time is it?”

“Ten minutes past two, sir,” answered the man, looking at the clock and blinking.

“Ten minutes past two? How horribly late! You must wake me at nine to-morrow. I have some work to do.”

“All right, sir.”

“Did any one call this evening?”

“Mr. Hallward, sir. He stayed here till eleven, and then he went away to catch his train.”

“Oh! I am sorry I didn’t see him. Did he leave any message?”

“No, sir, except that he would write to you from Paris, if he did not find you at the club.”

“That will do, Francis. Don’t forget to call me at nine to-morrow.”

“No, sir.”

The man shambled down the passage in his slippers.

Dorian Gray threw his hat and coat upon the table and passed into the library. For a quarter of an hour he walked up and down the room, biting his lip and thinking. Then he took down the Blue Book from one of the shelves and began to turn over the leaves. “Alan Campbell, 152, Hertford Street, Mayfair.” Yes; that was the man he wanted.