"All except Kirk." "Yes, Mr. Kirk used to call at all hours, and they used to sit together arf through the night sometimes--after Mr. Langton 'ad gone to bed. 'E's never up very late, 'e ain't." And then, after a few more questions, I allowed the cockney girl to return to the house, first, however, impressing upon her the need for secrecy, and adding another five shillings to that I had already given her. Half an hour later I saw the front door open, and Flynn, in dark overcoat and hard felt hat, ran down the steps and turned towards Oxford Street. Soon I was at his heels. He presently turned into Wigmore Street, crossed Cavendish Square, and continued through Mortimer Street into Wells Street, quite unconscious of being followed. He walked with an air of preoccupation, twice stopping to light his cigarette. Now that he was under my observation I did not intend that he should escape me. Besides, there was nothing suspicious about me, for I was merely a plain motor-mechanic, such as is seen about the London streets in dozens at all hours. Continuing down Wardour Street he came into Coventry Street, where he ascended the carpeted stairs to a saloon well known to a certain class of the habitues of the West End. In my mechanic's clothes I knew that the uniformed janitor at the bottom of the stairs would direct me to the public bar, therefore I was compelled to remain outside and await the doctor's exit. The place was evidently crowded, as it usually is, for it is one of the recognised nocturnal rendezvous in the neighbourhood of Leicester Square. I crossed the road and stood near the entrance to the Motor Club, of which I was a member. Many men I knew passed and repassed within its swing doors, but none recognised me. Therefore I was quite satisfied that, with my dirty face, Doctor Flynn would not easily identify me. At last he came forth, and alone. I saw by his hesitation on the kerb that he was disappointed. Someone he had expected had not turned up, and he was now undecided in which direction to walk. It was then about half-past ten, the quietest hour of the evening in that neighbourhood, yet the illuminated signs lent an air of gaiety to that scene so typical of London as the middle-class know it. Having lit a cigarette the doctor strolled down the Haymarket, and turning up Charles Street, passed the "Junior," crossed St. James's Square, where he entered the "Sports," made inquiry for someone, but found the person was not in. Then, continuing his way--while I walked at a respectable distance behind--he turned into Duke Street, where at a door about half-way up he paused and tugged at a bell. I took careful note of that door, one with a semi-circular fanlight above and a painted number, and then turned quickly on my heel to avoid passing him as he stood in my way upon the pavement.