I once ventured to hint something of the sort to him. I suggested that something he had said was in flat contradiction to all science and all experience. ‘No,’ he answered, ‘not all experience, for mine counts for something. I am no dealer in unproved theories; what I say I have proved for myself, and at a terrible cost. There is a region of knowledge which you will never know, which wise men seeing from afar off shun like the plague, as well they may, but into that region I have gone. If you knew, if you could even dream of what may be done, of what one or two men have done in this quiet world of ours, your very soul would shudder and faint within you. What you have heard from me has been but the merest husk and outer covering of true science—that science which means death, and that which is more awful than death, to those who gain it. No, when men say that there are strange things in the world, they little know the awe and the terror that dwell always with them and about them.’ There was a sort of fascination about the man that drew me to him, and I was quite sorry to have to leave London for a month or two; I missed his odd talk. A few days after I came back to town I thought I would look him up, but when I gave the two rings at the bell that used to summon him, there was no answer. I rang and rang again, and was just turning to go away, when the door opened and a dirty woman asked me what I wanted. From her look I fancy she took me for a plain-clothes officer after one of her lodgers, but when I inquired if Mr. Black were in, she gave me a stare of another kind. ‘There’s no Mr. Black lives here,’ she said. ‘He’s gone. He’s dead this six weeks. I always thought he was a bit queer in his head, or else had been and got into some trouble or other. He used to go out every morning from ten till one, and one Monday morning we heard him come in, and go into his room and shut the door, and a few minutes after, just as we was a-sitting down to our dinner, there was such a scream that I thought I should have gone right off. And then we heard a stamping, and down he came, raging and cursing most dreadful, swearing he had been robbed of something that was worth millions. And then he just dropped down in the passage, and we thought he was dead. We got him up to his room, and put him on his bed, and I just sat there and waited, while my ’usband he went for the doctor. And there was the winder wide open, and a little tin box he had lying on the floor open and empty, but of course nobody could possible have got in at the winder, and as for him having anything that was worth anything, it’s nonsense, for he was often weeks and weeks behind with his rent, and my ’usband he threatened often and often to turn him into the street, for, as he said, we’ve got a living to myke like other people—and, of course, that’s true; but, somehow, I didn’t like to do it, though he was an odd kind of a man, and I fancy had been better off. And then the doctor came and looked at him, and said as he couldn’t do nothing, and that night he died as I was a-sitting by his bed; and I can tell you that, with one thing and another, we lost money by him, for the few bits of clothes as he had were worth next to nothing when they came to be sold.’ I gave the woman half a sovereign for her trouble, and went home thinking of Dr. Black and the epitaph she had made him, and wondering at his strange fancy that he had been robbed. I take it that he had very little to fear on that score, poor fellow; but I suppose that he was really mad, and died in a sudden access of his mania. His landlady said that once or twice when she had had occasion to go into his room (to dun the poor wretch for his rent, most likely), he would keep her at the door for about a minute, and that when she came in she would find him putting away his tin box in the corner by the window; I suppose he had become possessed with the idea of some great treasure, and fancied himself a wealthy man in the midst of all his misery. Explicit, my tale is ended, and you see that though I knew Black, I know nothing of his wife or of the history of her death.—That’s the Harlesden case, Salisbury, and I think it interests me all the more deeply because there does not seem the shadow of a possibility that I or any one else will ever know more about it. What do you think of it?”

“Well, Dyson, I must say that I think you have contrived to surround the whole thing with a mystery of your own making. I go for the doctor’s solution: Black murdered his wife, being himself in all probability an undeveloped lunatic.”

“What? Do you believe, then, that this woman was something too awful, too terrible to be allowed to remain on the earth? You will remember that the doctor said it was the brain of a devil?”

“Yes, yes, but he was speaking, of course, metaphorically. It’s really quite a simple matter if you only look at it like that.”

“Ah, well, you may be right; but yet I am sure you are not.