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 which I had formed from the newspaper reports were entirely erroneous. And yet there were indications there, had they not been overlaid by other details which concealed their true import. I went to Devonshire with the conviction that Fitzroy Simpson was the true culprit, although, of course, I saw that the evidence against him was by no means complete.

"It was while I was in the carriage, just as we reached the trainer's house, that the immense significance of the curried mutton occurred to me. You may remember that I was distrait, and remained sitting after you had all alighted. I was marvelling in my own mind how I could possibly have overlooked so obvious a clue."

"I confess," said the Colonel, "that even now I cannot see how it helps us."

"It was the first link in my chain of reasoning. Powdered opium is by no means tasteless. The flavour is not disagreeable, but it is perceptible. Were it mixed with any ordinary dish, the eater would undoubtedly detect it, and would probably eat no more. A curry was exactly the medium which would disguise this taste. By no possible supposition could this stranger, Fitzroy Simpson, have caused curry to be served in the trainer's family that night, and it is surely too monstrous a coincidence to suppose that he happened to come along with powdered opium upon the very night when a dish happened to be served which would disguise the flavour. That is unthinkable. Therefore Simpson becomes eliminated from the case, and our attention centres upon Straker and his wife, the only two people who could have chosen curried mutton for supper that night. The opium was added after the dish was set aside for the stable boy, for the others had the same for supper with no ill effects. Which of them, then, had access to that dish without the maid seeing them?

"Before deciding that question I had grasped the significance of the silence of the dog, for one true inference invariably suggests others. The Simpson incident had shown me that a dog was kept in the stables, and yet, though someone had been in and had fetched out a horse, he had not barked enough to arouse the two lads in the loft. Obviously the midnight visitor was someone whom the dog knew well.

"I was already convinced, or almost convinced, that John Straker went down to the stables in the dead of the night and took out Silver Blaze. For what purpose? For a dishonest one, obviously, or why should he drug his own stable boy? And yet I was at a loss to know why. There have been cases before now where trainers have made sure of great sums of money by laying against their own horses, through agents, and then prevented them from winning by fraud. Sometimes it is a pulling jockey. Sometimes it is some surer and subtler means. What was it here? I hoped that the contents of his pockets might help me to form a conclusion.

"And they did so. You cannot have forgotten the singular knife which was found in the dead man's hand, a knife which certainly no sane man would choose for a weapon. It was, as Dr. Watson told us, a form of knife which is used for the most delicate operations known in surgery. And it was to be used for a delicate operation that night. You must know, with your wide experience of turf matters, Colonel Ross, that it is possible to make a slight nick upon the tendons of a horse's ham, and to do it subcutaneously so as to leave absolutely no trace. A horse so treated would develop a slight lameness which would be put down to a strain in exercise or a touch of rheumatism, but never to foul play."

"Villain! Scoundrel!" cried the Colonel.

"We have here the explanation of why John Straker wished to take the horse out on to the moor. So spirited a creature would have certainly roused the soundest of sleepers when it felt the prick of the knife. It was absolutely necessary to do it in the open air."

"I have been blind!" cried the Colonel. "Of course, that was why he needed the candle, and struck the match."

"Undoubtedly. But in examining his belongings, I was fortunate enough to discover, not only the method of the crime, but even its motives. As a man of the world, Colonel, you know that men do not carry other people's bills about in their pockets. We have most of us quite enough to do to settle our own. I at once concluded that Straker was leading a double life, and keeping a second establishment. The nature of the bill showed that there was a lady in the case, and one who had expensive tastes. Liberal as you are with your servants, one hardly expects that they can buy twenty-guinea walking dresses for their women. I questioned Mrs. Straker as to the dress without her knowing it, and having satisfied myself that it had never reached her, I made a note of the milliner's address, and felt that by calling there with Straker's photograph, I could easily dispose of the mythical Darbyshire.

"From that time on all was plain. Straker