my dear fellow...

"It is not for me, my dear Watson, to stand in the way of the official police force. I leave them all the evidence which I found. The poison still remained upon the talc had they the wit to find it. Now, Watson, we will light our lamp; we will, however, take the precaution to open our window to avoid the premature decease of two deserving members of society, and you will seat yourself near that open window in an armchair unless, like a sensible man, you determine to have nothing to do with the affair. Oh, you will see it out, will you? I thought I knew my Watson. This chair I will place opposite yours, so that we may be the same distance from the poison and face to face. The door we will leave ajar. Each is now in a position to watch the other and to bring the experiment to an end should the symptoms seem alarming. Is that all clear? Well, then, I take our powder--or what remains of it--from the envelope, and I lay it above the burning lamp. So! Now, Watson, let us sit down and await developments."

They were not long in coming. I had hardly settled in my chair before I was conscious of a thick, musky odour, subtle and nauseous. At the very first whiff of it my brain and my imagination were beyond all control. A thick, black cloud swirled before my eyes, and my mind told me that in this cloud, unseen as yet, but about to spring out upon my appalled senses, lurked all that was vaguely horrible, all that was monstrous and inconceivably wicked in the universe. Vague shapes swirled and swam amid the dark cloud-bank, each a menace and a warning of something coming, the advent of some unspeakable dweller upon the threshold, whose very shadow would blast my soul. A freezing horror took possession of me. I felt that my hair was rising, that my eyes were protruding, that my mouth was opened, and my tongue like leather. The turmoil within my brain was such that something must surely snap. I tried to scream and was vaguely aware of some hoarse croak which was my own voice, but distant and detached from myself. At the same moment, in some effort of escape, I broke through that cloud of despair and had a glimpse of Holmes's face, white, rigid, and drawn with horror--the very look which I had seen upon the features of the dead. It was that vision which gave me an instant of sanity and of strength. I dashed from my chair, threw my arms round Holmes, and together we lurched through the door, and an instant afterwards had thrown ourselves down upon the grass plot and were lying side by side, conscious only of the glorious sunshine which was bursting its way through the hellish cloud of terror which had girt us in. Slowly it rose from our souls like the mists from a landscape until peace and reason had returned, and we were sitting upon the grass, wiping our clammy foreheads, and looking with apprehension at each other to mark the last traces of that terrific experience which we had undergone.

"Upon my word, Watson!" said Holmes at last with an unsteady voice, "I owe you both my thanks and an apology. It was an unjustifiable experiment even for one's self, and doubly so for a friend. I am really very sorry."

"You know," I answered with some emotion, for I have never seen so much of Holmes's heart before, "that it is my greatest joy and privilege to help you."

In an instant he had whisked out a revolver from his breast and had fired two shots. I felt a sudden hot sear as if a red-hot iron had been pressed to my thigh. There was a crash as Holmes’s pistol came down on the man’s head. I had a vision of him sprawling upon the floor with blood running down his face while Holmes rummaged him for weapons. Then my friend’s wiry arms were round me, and he was leading me to a chair.

“You’re not hurt, Watson? For God’s sake, say that you are not hurt!”

It was worth a wound–it was worth many wounds–to know the depth of loyalty and love which lay behind that cold mask. The clear, hard eyes were dimmed for a moment, and the firm lips were shaking. For the one and only time I caught a glimpse of a great heart as well as of a great brain. All my years of humble but single-minded service culminated in that moment of revelation.

“It’s nothing, Holmes. It’s a mere scratch.”

He had ripped up my trousers with his pocket-knife.

“You are right,” he cried with an immense sigh of relief. “It is quite superficial.” His face set like flint as he glared at our prisoner, who was sitting up with a dazed face. “By the Lord, it is as well for you. If you had killed Watson, you would not have got out of this room alive. Now, sir, what have you to say for yourself?”

Holmes is sat in his chair in his rooms in Baker Street. Dr Watson looks at him in surprise

Watson:  I don't believe it, Holmes. You say you have a brother who has greater intelligence than you?

Holmes: Oh indeed, Watson. My brother Minecraft Holmes possesses a far greater faculty for observation and deduction than I. He simply uses it in his own esoteric interest. If we visit him at his club in Pall Mall, I can show you.

Somewhere in Pall Mall...

Holmes and Watson enter a room where the 'absolutely corpulent' figure of Holmes' brother is standing over a large machine with numerous cams and wheels.

Sherlock: My dear Minecraft!

Watson: (to Holmes) I say! What is that incredible machine

Minecraft: Sherlock, old boy! You've come at an excellent moment.

Sherlock: (to Watson)  It is a computational device, inspired by Babbage's analytical engine. With it, Minecraft can perform calculations beyond the capability of the human mind.

Watson: What kinds of things does he calculate?

Minecraft: Apparently there is an ocean monument within 120 blocks of my spawn point. If can only find some diamond to mine obsidian and create a Nether Portal, I can aquire a blaze rod and some Netherwart to make an underwather breathing potion.