" 'Well, I don't know now whether it was pure deviltry on the part of this woman, or whether she thought that she could turn me against my wife by encouraging her to misbehave. Anyway, she took a house just two streets off and let lodgings to sailors. Fairbairn used to stay there, and Mary would go round to have tea with her sister and him. How often she went I don't know, but I followed her one day, and as I broke in at the door Fairbairn got away over the back garden wall, like the cowardly skunk that he was. I swore to my wife that I would kill her if I found her in his company again, and I led her back with me, sobbing and trembling, and as white as a piece of paper. There was no trace of love between us any longer. I could see that she hated me and feared me, and when the thought of it drove me to drink, then she despised me as well.

" 'Well, Sarah found that she could not make a living in Liverpool, so she went back, as I understand, to live with her sister in Croydon, and things jogged on much the same as ever at home. And then came this last week and all the misery and ruin.

" 'It was in this way. We had gone on the May Day for a round voyage of seven days, but a hogshead got loose and started one of our plates, so that we had to put back into port for twelve hours. I left the ship and came home, thinking what a surprise it would be for my wife, and hoping that maybe she would be glad to see me so soon. The thought was in my head as I turned into my own street, and at that moment a cab passed me, and there she was, sitting by the side of Fairbairn, the two chatting and laughing, with never a thought for me as I stood watching them from the footpath.

" 'I tell you, and I give you my word for it, that from that moment I was not my own master, and it is all like a dim dream when I look back on it. I had been drinking hard of late, and the two things together fairly turned my brain. There's something throbbing in my head now, like a docker's hammer, but that morning I seemed to have all Niagara whizzing and buzzing in my ears.

" 'Well, I took to my heels, and l ran after the cab. I had a heavy oak stick in my hand, and I tell you I saw red from the first; but as I ran I got cunning, too, and hung back a little to see them without being seen. They pulled up soon at the railway station. There was a good crowd round the booking-office, so I got quite close to them without being seen. They took tickets for New Brighton. So did I, but I got in three carriages behind them. When we reached it they walked along the Parade, and I was never more than a hundred yards from them. At last I saw them hire a boat and start for a row, for it was a very hot day, and they thought, no doubt, that it would be cooler on the water.

" 'It was just as if they had been given into my hands. There was a bit of a haze, and you could not see more than a few hundred yards. I hired a boat for myself, and I pulled after them. I could see the blur of their craft, but they were going nearly as fast as I, and they must have been a long mile from the shore before I caught them up. The haze was like a curtain all round us, and there were we three in the middle of it. My God, shall I ever forget their faces when they saw who was in the boat that was closing in upon them? She screamed out. He swore like a madman and jabbed at me with an oar, for he must have seen death in my eyes. I got past it and got one in with my stick that crushed his head like an egg. I would have spared her, perhaps, for all my madness, but she threw her arms round him, crying out to him, and calling him "Alec." I struck again, and she lay stretched beside him. I was like a wild beast then that had tasted blood. If Sarah had been there, by the Lord, she should have joined them. I pulled out my knife, and – well, there! I've said enough. It gave me a kind of savage joy when I thought how Sarah would feel when she had such signs as these of what her meddling had brought about. Then I tied the bodies into the boat, stove a plank, and stood by until they had sunk. I knew very well that the owner would think that they had lost their bearings in the haze, and had drifted off out to sea. I cleaned myself up, got back to land, and joined my ship without a soul having a suspicion of what had passed. That night I made up the packet for Sarah Cushing, and next day I sent it from Belfast.

" 'There you have the whole truth of it. You can hang me, or do what you like with me, but you cannot punish me as I have been punished already. I cannot shut my eyes but I see those two faces staring at me – staring at me as they stared when my boat broke through the haze. I killed them quick, but they are killing me slow; and if I have another night of it I shall be either mad or dead before morning. You won't put me alone into a cell, sir? For pity's sake don't, and may you be treated in your day of agony as you treat me now.'

"What is the meaning of it, Watson?" said Holmes solemnly as he laid down the paper. "What object is served by this circle of misery and violence and fear? It must tend to some end, or else our universe is ruled by chance, which is unthinkable. But what end? There is the great standing perennial problem to which human reason is as far from an answer as ever."

In the third week of November, in the year 1895, a dense yellow fog settled down upon London. From the Monday to the Thursday I doubt whether it was ever possible from our windows in Baker Street to see the loom of the opposite houses. The first day Holmes had spent in cross-indexing his huge book of references. The second and third had been patiently occupied upon a subject which he had recently made his hobby – the music of the Middle Ages. But when, for the fourth time, after pushing back our chairs from breakfast we saw the greasy, heavy brown swirl still drifting past us and condensing in oily drops upon the windowpanes, my comrade's impatient and active nature could endure this drab existence no longer. He paced restlessly about our sitting-room in a fever of suppressed energy, biting his nails, tapping the furniture, and chafing against inaction. "Nothing of interest in the paper, Watson?" he said.

I was aware that by anything of interest, Holmes meant anything of criminal interest. There was the news of a revolution, of a possible war, and of an impending change of government; but these did not come within the horizon of my companion. I could see nothing recorded in the shape of crime which was not commonplace and futile.

Holmes groaned and resumed his restless meanderings. "The London criminal is certainly a dull fellow," said he in the querulous voice of the sportsman whose game has failed him. "Look out of this window, Watson. See how the figures loom up, are dimly seen, and then blend once more into the cloud bank. The thief or the murderer could roam London on such a day as the tiger does the jungle, unseen until he pounces, and then evident only to his victim."

"There have," said I, "been numerous petty thefts."

Holmes snorted his contempt. "This great and somber stage is set for something more worthy than that," said he. "It is fortunate for this community that I am not a criminal."

"It is, indeed!" said I heartily.

"Suppose that I were Brooks or Woodhouse, or any of the fifty men who have good reason for taking my life, how long could I survive against my own pursuit? A summons, a bogus appointment, and all would be over. It is well they don't have days of fog in the Latin countries – the countries of assassination. By Jove! here comes something at last to break our dead monotony."

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."