For a minute I stood there with the paper in my hands thinking out the meaning of this curt message. It was I, then, and not Sir Henry, who was being dogged by this secret man. He had not followed me himself, but he had set an agent - the boy, perhaps - upon my track, and this was his report. Possibly I had taken no step since I had been upon the moor which had not been observed and reported. Always there was this feeling of an unseen force, a fine net drawn round us with infinite skill and delicacy, holding us so lightly that it was only at some supreme moment that one realized that one was indeed entangled in its meshes.

If there was one report there might be others, so I looked round the hut in search of them. There was no trace, however, of anything of the kind, nor could I discover any sign which might indicate the character or intentions of the man who lived in this singular place, save that he must be of Spartan habits and cared little for the comforts of life. When I thought of the heavy rains and looked at the gaping roof I understood how strong and immutable must be the purpose which had kept him in that inhospitable abode. Was he our malignant enemy, or was he by chance our guardian angel? I swore that I would not leave the hut until I knew.

Outside the sun was sinking low and the west was blazing with scarlet and gold. Its reflection was shot back in ruddy patches by the distant pools which lay amid the great Grimpen Mire. There were the two towers of Baskerville Hall, and there a distant blur of smoke which marked the village of Grimpen. Between the two, behind the hill, was the house of the Stapletons. All was sweet and mellow and peaceful in the golden evening light, and yet as I looked at them my soul shared none of the peace of Nature but quivered at the vagueness and the terror of that interview which every instant was bringing nearer. With tingling nerves but a fixed purpose, I sat in the dark recess of the hut and waited with sombre patience for the coming of its tenant.

And then at last I heard him. Far away came the sharp clink of a boot striking upon a stone. Then another and yet another, coming nearer and nearer. I shrank back into the darkest corner and cocked the pistol in my pocket, determined not to discover myself until I had an opportunity of seeing something of the stranger. There was a long pause which showed that he had stopped. Then once more the footsteps approached and a shadow fell across the opening of the hut.

“It is a lovely evening, my dear Watson,” said a well-known voice. “I really think that you will be more comfortable outside than in.”