"I will not force it upon you," said he dryly, "but perhaps I am a better judge of human nature than yourself. However, we shall soon discover something; we shall not be kept long in the dark." We had little difficulty in finding the house inhabited by Mr. Nisbet, and its appearance deepened my apprehensions. In saying that we found the house I am not quite exact, for a high wall surrounded it, and only the gables could be seen. This wall was of surprising extent, and could have occupied not less than an acre of ground. It was of stone, and might have been built round a prison. We walked cautiously around it, keeping close in its shadow and prepared at any moment to stroll carelessly away in the event of an inmate issuing from either of the gates--one in the front, the other in the rear--which afforded ingress to it. Night had fallen, and there was no moon, so that we were comparatively safe from observation, but this did not make us less cautious in our movements. We were waging our silent battle with a wary foe, and to be taken unaware would be fatal to us. There was no other house near the building. At no great distance were towering ranges of rock and tree which intensified the gloom of the habitation. Retreating to a hillock we ascended it, and from that height perceived lights in some of the upper windows. "A pleasant residence," said Mr. Rivers, with a slight shiver. "One can imagine any deed of darkness being perpetrated within those walls. Hush! Don't move!" I saw the reason for the caution. The hill on which we stood faced the gate in the rear of the house, and as Mr. Rivers laid hold of me and whispered in my ear, this gate was slowly opened and a form issued from it. I could not at that distance distinguish whether it was the form of a man or a woman; what I could distinguish was that the figure paused a moment or two and seemed to peer within the grounds. Then, closing the gate with an appearance of caution, the figure came into the open, and limped away. "Step softly," whispered Mr. Rivers, and taking me by the hand we followed the figure, which we presently discerned to be that of an old woman, who walked as if she were lame. I stepped almost as softly as my companion, and we succeeded in approaching close to her without being observed. She was carrying something in her hands, covered with a white cloth. Night's shadows befriended us, and it was evident that the woman had no notion that she was being followed. Mr. Rivers did not speak, nor did I. We must have walked half a mile when the woman stopped before a wretched hut, which she entered without knocking. "We must see what she's up to," whispered Mr. Rivers. "She belongs to Mr. Nisbet's house, and has crept away in secret. It is my opinion we're in luck."