“We have found traces which show that a party of gypsies encamped on Monday night within a mile of the spot where the murder took place. On Tuesday they were gone. Now, presuming that there was some understanding between Simpson and these gypsies, might he not have been leading the horse to them when he was overtaken, and may they not have him now?”

“It is certainly possible.”

“The moor is being scoured for these gypsies. I have also examined every stable and outhouse in Tavistock, and for a radius of ten miles.”

“There is another training-stable quite close, I understand?”

“Yes, and that is a factor which we must certainly not neglect. As Desborough, their horse, was second in the betting, they had an interest in the disappearance of the favourite. Silas Brown, the trainer, is known to have had large bets upon the event, and he was no friend to poor Straker. We have, however, examined the stables, and there is nothing to connect him with the affair.”

“And nothing to connect this man Simpson with the interests of the Mapleton stables?”

“Nothing at all.”

Holmes leaned back in the carriage, and the conversation ceased. A few minutes later our driver pulled up at a neat little red-brick villa with overhanging eaves which stood by the road. Some distance off, across a paddock, lay a long gray-tiled outbuilding. In every other direction the low curves of the moor, bronze-coloured from the fading ferns, stretched away to the sky-line, broken only by the steeples of Tavistock, and by a cluster of houses away to the westward which marked the Mapleton stables. We all sprang out with the exception of Holmes, who continued to lean back with his eyes fixed upon the sky in front of him, entirely absorbed in his own thoughts. It was only when I touched his arm that he roused himself with a violent start and stepped out of the carriage.

“Excuse me,” said he, turning to Colonel Ross, who had looked at him in some surprise. “I was day-dreaming.” There was a gleam in his eyes and a suppressed excitement in his manner which convinced me, used as I was to his ways, that his hand was upon a clue, though I could not imagine where he had found it.

“Perhaps you would prefer at once to go on to the scene of the crime, Mr. Holmes?” said Gregory.

“I think that I should prefer to stay here a little and go into one or two questions of detail. Straker was brought back here, I presume?”

“Yes, he lies upstairs. The inquest is to-morrow.”

“He has been in your service some years, Colonel Ross?”

“I have always found him an excellent servant.”

“I presume that you made an inventory of what he had in his pockets at the time of his death, Inspector?”

“I have the things themselves in the sitting-room if you would care to see them.”

“I should be very glad.” We all filed into the front room and sat round the central table while the inspector unlocked a square tin box and laid a small heap of things before us. There was a box of vestas, two inches of tallow candle, an A D P brier-root pipe, a pouch of sealskin with half an ounce of long-cut Cavendish, a silver watch with a gold chain, five sovereigns in gold, an aluminum pencil-case, a few papers, and an ivory-handled knife with a very delicate, inflexible blade marked Weiss & Co., London.

“This is a very singular knife,” said Holmes, lifting it up and examining it minutely. “I presume, as I see blood-stains upon it, that it is the one which was found in the dead man’s grasp. Watson, this knife is surely in your line?”

“It is what we call a cataract knife,” said I.

“I thought so. A very delicate blade devised for very delicate work. A strange thing for a man to carry with him upon a rough expedition, especially as it would not shut in his pocket.”