Casting the Runes is a short story about a man plagued by an occultist who may or may not be drawing on dark powers to bring about the doom of those who cross him. A sample of the deeds of the nefarious Karswell:
Now, Florence, listen to this. The first winter he was at Lufford this delightful neighbour of ours wrote to the clergyman of his parish (he's not ours, but we know him very well) and offered to show the school children some magic-lantern slides. He said he had some new kinds, which he thought would interest them. Well, the clergyman was rather surprised, because Mr Karswell had shown himself inclined to be unpleasant to the children--complaining of their trespassing, or something of the sort; but of course he accepted, and the evening was fixed, and our friend went himself to see that everything went right.
He said he never had been so thankful for anything as that his own children were all prevented from being there: they were at a children's party at our house, as a matter of fact. Because this Mr Karswell had evidently set out with the intention of frightening these poor village children out of their wits, and I do believe, if he had been allowed to go on, he would actually have done so. He began with some comparatively mild things. Red Riding Hood was one, and even then, Mr Farrer said, the wolf was so dreadful that several of the smaller children had to be taken out: and he said Mr Karswell began the story by producing a noise like a wolf howling in the distance, which was the most gruesome thing he had ever heard. All the slides he showed, Mr Farrer said, were most clever; they were absolutely realistic, and where he had got them or how he worked them he could not imagine.
Well, the show went on, and the stories kept on becoming a little more terrifying each time, and the children were mesmerized into complete silence. At last he produced a series which represented a little boy passing through his own park--Lufford, I mean--in the evening. Every child in the room could recognize the place from the pictures. And this poor boy was followed, and at last pursued and overtaken, and either torn in pieces or somehow made away with, by a horrible hopping creature in white, which you saw first dodging about among the trees, and gradually it appeared more and more plainly. Mr Farrer said it gave him one of the worst nightmares he ever remembered, and what it must have meant to the children doesn't bear thinking of. Of course this was too much, and he spoke very sharply indeed to Mr Karswell, and said it couldn't go on.
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All he said was: 'Oh, you think it's time to bring our little show to an end and send them home to their beds? Very well!' And then, if you please, he switched on another slide, which showed a great mass of snakes, centipedes, and disgusting creatures with wings, and somehow or other made it seem as if they were climbing out of the picture and getting in amongst the audience; and this was accompanied by a sort of dry rustling noise which sent the children nearly mad, and of course they stampeded. A good many of them were rather hurt in getting out of the room, and I don't suppose one of them closed an eye that night.