“Inspector Gregory, to whom the case has been committed, is an extremely competent officer. Were he but gifted with imagination he might rise to great heights in his profession. On his arrival he promptly found and arrested the man upon whom suspicion naturally rested. There was little difficulty in finding him, for he inhabited one of those villas which I have mentioned. His name, it appears, was Fitzroy Simpson. He was a man of excellent birth and education, who had squandered a fortune upon the turf, and who lived now by doing a little quiet and genteel book-making in the sporting clubs of London. An examination of his betting-book shows that bets to the amount of five thousand pounds had been registered by him against the favourite. On being arrested he volunteered the statement that he had come down to Dartmoor in the hope of getting some information about the King’s Pyland horses, and also about Desborough, the second favourite, which was in charge of Silas Brown at the Mapleton stables. He did not attempt to deny that he had acted as described upon the evening before, but declared that he had no sinister designs and had simply wished to obtain first-hand information. When confronted with his cravat he turned very pale and was utterly unable to account for its presence in the hand of the murdered man. His wet clothing showed that he had been out in the storm of the night before, and his stick, which was a penang-lawyer weighted with lead, was just such a weapon as might, by repeated blows, have inflicted the terrible injuries to which the trainer had succumbed. On the other hand, there was no wound upon his person, while the state of Straker’s knife would show that one at least of his assailants must bear his mark upon him. There you have it all in a nutshell, Watson, and if you can give me any light I shall be infinitely obliged to you.”

I had listened with the greatest interest to the statement which Holmes, with characteristic clearness, had laid before me. Though most of the facts were familiar to me, I had not sufficiently appreciated their relative importance, nor their connection to each other.

“Is it not possible,” I suggested, “that the incised wound upon Straker may have been caused by his own knife in the convulsive struggles which follow any brain injury?”

“It is more than possible; it is probable,” said Holmes. “In that case one of the main points in favour of the accused disappears.”

“And yet,” said I, “even now I fail to understand what the theory of the police can be.”

“I am afraid that whatever theory we state has very grave objections to it,” returned my companion. “The police imagine, I take it, that this Fitzroy Simpson, having drugged the lad, and having in some way obtained a duplicate key, opened the stable door and took out the horse, with the intention, apparently, of kidnapping him altogether. His bridle is missing, so that Simpson must have put this on. Then, having left the door open behind him, he was leading the horse away over the moor when he was either met or overtaken by the trainer. A row naturally ensued. Simpson beat out the trainer’s brains with his heavy stick without receiving any injury from the small knife which Straker used in self-defence, and then the thief either led the horse on to some secret hiding-place, or else it may have bolted during the struggle, and be now wandering out on the moors. That is the case as it appears to the police, and improbable as it is, all other explanations are more improbable still. However, I shall very quickly test the matter when I am once upon the spot, and until then I cannot really see how we can get much further than our present position.”