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It was the maid with a telegram. Holmes tore it open and burst out laughing.

“Well, well! What next?” said he. “Brother Mycroft is coming round.”

“Why not?” I asked.

“Why not? It is as if you met a tram-car coming down a country lane. Mycroft has his rails and he runs on them. His Pall Mall lodgings, the Diogenes Club, Whitehall– that is his cycle. Once, and only once, he has been here. What upheaval can possibly have derailed him?”

“Does he not explain?”

Holmes handed me his brother’s telegram.

Must see you over Cadogan West. Coming at once.
MYCROFT.

“Cadogan West? I have heard the name.”

“It recalls nothing to my mind. But that Mycroft should break out in this erratic fashion! A planet might as well leave its orbit. By the way, do you know what Mycroft is?”

I had some vague recollection of an explanation at the time of the Adventure of the Greek Interpreter.

“You told me that he had some small office under the British government.”

Holmes chuckled.

“I did not know you quite so well in those days. One has to be discreet when one talks of high matters of state. You are right in thinking that he is under the British government. You would also be right in a sense if you said that occasionally he is the British government.”

“My dear Holmes!”

“I thought I might surprise you. Mycroft draws four hundred and fifty pounds a year, remains a subordinate, has no ambitions of any kind, will receive neither honour nor title, but remains the most indispensable man in the country.”

“But how?”

“Well, his position is unique. He has made it for himself. There has never been anything like it before, nor will be again. He has the tidiest and most orderly brain, with the greatest capacity for storing facts, of any man living. The same great powers which I have turned to the detection of crime he has used for this particular business. The conclusions of every department are passed to him, and he is the central exchange, the clearing-house, which makes out the balance. All other men are specialists, but his specialism is omniscience. We will suppose that a minister needs information as to a point which involves the Navy, India, Canada and the bimetallic question; he could get his separate advices from various departments upon each, but only Mycroft can focus them all, and say offhand how each factor would affect the other. They began by using him as a short-cut, a convenience; now he has made himself an essential. In that great brain of his everything is pigeon-holed and can be handed out in an instant. Again and again his word has decided the national policy. He lives in it. He thinks of nothing else save when, as an intellectual exercise, he unbends if I call upon him and ask him to advise me on one of my little problems. But Jupiter is descending to-day. What on earth can it mean? Who is Cadogan West, and what is he to Mycroft?”

“I have it,” I cried, and plunged among the litter of papers upon the sofa.”Yes, yes, here he is, sure enough! Cadogan West was the young man who was found dead on the Underground on Tuesday morning.”

Holmes sat up at attention, his pipe halfway to his lips.

“This must be serious, Watson. A death which has caused my brother to alter his habits can be no ordinary one. What in the world can he have to do with it? The case was featureless as I remember it. The young man had apparently fallen out of the train and killed himself. He had not been robbed, and there was no particular reason to suspect violence. Is that not so?”