Holmes gave a whimsical smile.

“I think I may safely promise that,” said he. “I may add that your problem interests me, and that I shall be prepared to look into it. How shall I keep in touch with you?”

“The Carlton Club will find me. But in case of emergency, there is a private telephone call, ‘XX.31.’ ”

Holmes noted it down and sat, still smiling, with the open memorandum-book upon his knee.

“The Baron’s present address, please?”

“Vernon Lodge, near Kingston. It is a large house. He has been fortunate in some rather shady speculations and is a rich man, which naturally makes him a more dangerous antagonist.”

“Is he at home at present?”

“Yes.”

“Apart from what you have told me, can you give me any further information about the man?”

“He has expensive tastes. He is a horse fancier. For a short time he played polo at Hurlingham, but then this Prague affair got noised about and he had to leave. He collects books and pictures. He is a man with a considerable artistic side to his nature. He is, I believe, a recognized authority upon Chinese pottery and has written a book upon the subject.”

“A complex mind,” said Holmes. “All great criminals have that. My old friend Charlie Peace was a violin virtuoso. Wainwright was no mean artist. I could quote many more. Well, Sir James, you will inform your client that I am turning my mind upon Baron Gruner. I can say no more. I have some sources of information of my own, and I dare say we may find some means of opening the matter up.”

When our visitor had left us Holmes sat so long in deep thought that it seemed to me that he had forgotten my presence. At last, however, he came briskly back to earth.

“Well, Watson, any views?” he asked.

“I should think you had better see the young lady herself.”

“My dear Watson, if her poor old broken father cannot move her, how shall I, a stranger, prevail? And yet there is something in the suggestion if all else fails. But I think we must begin from a different angle. I rather fancy that Shinwell Johnson might be a help.”

I have not had occasion to mention Shinwell Johnson in these memoirs because I have seldom drawn my cases from the latter phases of my friend’s career . During the first years of the century he became a valuable assistant. Johnson, I grieve to say, made his name first as a very dangerous villain and served two terms at Parkhurst. Finally he repented and allied himself to Holmes, acting as his agent in the huge criminal underworld of London and obtaining information which often proved to be of vital importance. Had Johnson been a “nark” of the police he would soon have been exposed, but as he dealt with cases which never came directly into the courts, his activities were never realized by his companions. With the glamour of his two convictions upon him, he had the entree of every night-club, doss house, and gambling-den in the town, and his quick observation and active brain made him an ideal agent for gaining information. It was to him that Sherlock Holmes now proposed to turn.