It is satisfactory to know that there can be no difference of opinion upon this case, since Mr. Lestrade, one of the most experienced members of the official force, and Mr. Sherlock Holmes, the well-known consulting expert, have each come to the conclusion that the grotesque series of incidents, which have ended in so tragic a fashion, arise from lunacy rather than from deliberate crime. No explanation save mental aberration can cover the facts.

“The Press, Watson, is a most valuable institution, if you only know how to use it. And now, if you have quite finished, we will hark back to Kensington and see what the manager of Harding Brothers has to say on the matter.”

The founder of that great emporium proved to be a brisk, crisp little person, very dapper and quick, with a clear head and a ready tongue.

“Yes, sir, I have already read the account in the evening papers. Mr. Horace Harker is a customer of ours. We supplied him with the bust some months ago. We ordered three busts of that sort from Gelder & Co., of Stepney. They are all sold now. To whom? Oh, I daresay by consulting our sales book we could very easily tell you. Yes, we have the entries here. One to Mr. Harker you see, and one to Mr. Josiah Brown, of Laburnum Lodge, Laburnum Vale, Chiswick, and one to Mr. Sandeford, of Lower Grove Road, Reading. No, I have never seen this face which you show me in the photograph. You would hardly forget it, would you, sir, for I’ve seldom seen an uglier. Have we any Italians on the staff? Yes, sir, we have several among our workpeople and cleaners. I daresay they might get a peep at that sales book if they wanted to. There is no particular reason for keeping a watch upon that book. Well, well, it’s a very strange business, and I hope that you will let me know if anything comes of your inquiries.”

Holmes had taken several notes during Mr. Harding’s evidence, and I could see that he was thoroughly satisfied by the turn which affairs were taking. He made no remark, however, save that, unless we hurried, we should be late for our appointment with Lestrade. Sure enough, when we reached Baker Street the detective was already there, and we found him pacing up and down in a fever of impatience. His look of importance showed that his day’s work had not been in vain.

“Well?” he asked. “What luck, Mr. Holmes?”

“We have had a very busy day, and not entirely a wasted one,” my friend explained. “We have seen both the retailers and also the wholesale manufacturers. I can trace each of the busts now from the beginning.”

“The busts!” cried Lestrade. “Well, well, you have your own methods, Mr. Sherlock Holmes, and it is not for me to say a word against them, but I think I have done a better day’s work than you. I have identified the dead man.”

“You don’t say so?”

“And found a cause for the crime.”

“Splendid!”

“We have an inspector who makes a specialty of Saffron Hill and the Italian Quarter. Well, this dead man had some Catholic emblem round his neck, and that, along with his colour, made me think he was from the South. Inspector Hill knew him the moment he caught sight of him. His name is Pietro Venucci, from Naples, and he is one of the greatest cut-throats in London. He is connected with the Mafia, which, as you know, is a secret political society, enforcing its decrees by murder. Now, you see how the affair begins to clear up. The other fellow is probably an Italian also, and a member of the Mafia. He has broken the rules in some fashion. Pietro is set upon his track. Probably the photograph we found in his pocket is the man himself, so that he may not knife the wrong person. He dogs the fellow, he sees him enter a house, he waits outside for him, and in the scuffle he receives his own death-wound. How is that, Mr. Sherlock Holmes?”

Holmes clapped his hands approvingly.