Surely that is clear.”

“Where is he, then?”

“I have already said that he must have gone to King's Pyland or to Mapleton. He is not at King's Pyland. Therefore he is at Mapleton. Let us take that as a working hypothesis and see what it leads us to. This part of the moor, as the Inspector remarked, is very hard and dry. But it falls away towards Mapleton, and you can see from here that there is a long hollow over yonder, which must have been very wet on Monday night. If our supposition is correct, then the horse must have crossed that, and there is the point where we should look for his tracks.”

We had been walking briskly during this conversation, and a few more minutes brought us to the hollow in question. At Holmes' request I walked down the bank to the right, and he to the left, but I had not taken fifty paces before I heard him give a shout, and saw him waving his hand to me. The track of a horse was plainly outlined in the soft earth in front of him, and the shoe which he took from his pocket exactly fitted the impression.

“See the value of imagination,” said Holmes. “It is the one quality which Gregory lacks. We imagined what might have happened, acted upon the supposition, and find ourselves justified. Let us proceed.”

We crossed the marshy bottom and passed over a quarter of a mile of dry, hard turf. Again the ground sloped, and again we came on the tracks. Then we lost them for half a mile, but only to pick them up once more quite close to Mapleton. It was Holmes who saw them first, and he stood pointing with a look of triumph upon his face. A man's track was visible beside the horse's.

“The horse was alone before,” I cried.

“Quite so. It was alone before. Hullo, what is this?”

The double track turned sharp off and took the direction of King's Pyland. Holmes whistled, and we both followed along after it. His eyes were on the trail, but I happened to look a little to one side, and saw to my surprise the same tracks coming back again in the opposite direction.

“One for you, Watson,” said Holmes, when I pointed it out. “You have saved us a long walk, which would have brought us back on our own traces. Let us follow the return track.”

We had not to go far. It ended at the paving of asphalt which led up to the gates of the Mapleton stables. As we approached, a groom ran out from them.

“We don't want any loiterers about here,” said he.

“I only wished to ask a question,” said Holmes, with his finger and thumb in his waistcoat pocket. “Should I be too early to see your master, Mr. Silas Brown, if I were to call at five o'clock to-morrow morning?”

“Bless you, sir, if any one is about he will be, for he is always the first stirring. But here he is, sir, to answer your questions for himself. No, sir, no; it is as much as my place is worth to let him see me touch your money. Afterwards, if you like.”

As Sherlock Holmes replaced the half-crown which he had drawn from his pocket, a fierce-looking elderly man strode out from the gate with a hunting-crop swinging in his hand.

“What's this, Dawson!” he cried. “No gossiping! Go about your business! And you, what the devil do you want here?”

“Ten minutes' talk with you, my good sir,” said Holmes in the sweetest of voices.

“I've no time to talk to every gadabout.