“My collection of M’s is a fine one,” said he. “Moriarty himself is enough to make any letter illustrious, and here is Morgan the poisoner, and Merridew of abominable memory, and Mathews, who knocked out my left canine in the waiting-room at Charing Cross, and, finally, here is our friend of to-night.”

He handed over the book, and I read:

Moran, Sebastian, Colonel. Unemployed. Formerly 1st Bangalore Pioneers. Born London, 1840. Son of Sir Augustus Moran, C. B., once British Minister to Persia. Educated Eton and Oxford. Served in Jowaki Campaign, Afghan Campaign, Charasiab (despatches), Sherpur, and Cabul. Author of Heavy Game of the Western Himalayas (1881); Three Months in the Jungle (1884). Address: Conduit Street. Clubs: The Anglo-Indian, the Tankerville, the Bagatelle Card Club.

On the margin was written, in Holmes’s precise hand:

The second most dangerous man in London.

“This is astonishing,” said I, as I handed back the volume. “The man’s career is that of an honourable soldier.”

“It is true,” Holmes answered. “Up to a certain point he did well. He was always a man of iron nerve, and the story is still told in India how he crawled down a drain after a wounded man-eating tiger. There are some trees, Watson, which grow to a certain height, and then suddenly develop some unsightly eccentricity. You will see it often in humans. I have a theory that the individual represents in his development the whole procession of his ancestors, and that such a sudden turn to good or evil stands for some strong influence which came into the line of his pedigree. The person becomes, as it were, the epitome of the history of his own family.”

“It is surely rather fanciful.”

“Well, I don’t insist upon it. Whatever the cause, Colonel Moran began to go wrong. Without any open scandal, he still made India too hot to hold him. He retired, came to London, and again acquired an evil name. It was at this time that he was sought out by Professor Moriarty, to whom for a time he was chief of the staff. Moriarty supplied him liberally with money, and used him only in one or two very high-class jobs, which no ordinary criminal could have undertaken. You may have some recollection of the death of Mrs. Stewart, of Lauder, in 1887. Not? Well, I am sure Moran was at the bottom of it, but nothing could be proved. So cleverly was the colonel concealed that, even when the Moriarty gang was broken up, we could not incriminate him. You remember at that date, when I called upon you in your rooms, how I put up the shutters for fear of air-guns? No doubt you thought me fanciful. I knew exactly what I was doing, for I knew of the existence of this remarkable gun, and I knew also that one of the best shots in the world would be behind it. When we were in Switzerland he followed us with Moriarty, and it was undoubtedly he who gave me that evil five minutes on the Reichenbach ledge.