"I was consequently in a fever of impatience to follow them in, and had at last made up my mind to do so, when I heard a deep sigh, and glancing up towards the doorway, saw that it was again occupied by the dark figure which I had so lately seen pass in with Mr. Barrows. He had no lantern now, and I could not even discern the full outlines of his form, but his sigh being repeated, I knew who he was as certainly as if I had seen him, for it was one which had often been breathed in my ears, and was as well known to me as the beatings of my own heart. This discovery, as you may believe, Miss Sterling, did not tend to allay either my curiosity or my impatience, and when in a few minutes the watcher drew back, I stole from my hiding-place, and creeping up to the open doorway, listened. A sound of pacing steps came to my ears. The entrance was guarded. "For a moment I stood baffled, then remembering the lantern which had been carried into the building, I withdrew quietly from the door, and began a tour of inspection round about the mill in the hope of spying some glimmer of light from one or more of the many windows, and in this way learn the exact spot to which Mr. Barrows had been taken. It was a task of no mean difficulty, Miss Sterling, for the bushes cluster thick about those walls, and I had no light to warn me of their whereabouts or of the many loose stones that lay in heaps here and there along the way. But I would not have stopped if firebrands had been under my feet, nor did I cease my exertions or lose my hope till I reached the back of the mill and found it as dark as the side and front. Then indeed I did begin to despair, for the place was so solitary and remote from observation, I could not conceive of any better being found for purposes that required secrecy or concealment. Yet the sombre walls rose before me, dark and unrelieved against the sky; and nothing remained for me but to press on to the broad west end and see if that presented as unpromising an aspect as the rest. "I accordingly recommenced my toilsome journey, rendered positively dangerous now by the vicinity of the water and the steepness of the banks that led down to it. But I did not go far, for as, in my avoidance of the stream, I drew nearer and nearer the walls, I caught glimpses of what I at first thought to be the flash of a fire-fly in the bushes, but in another moment discovered to be the fitful glimmer of a light through a window heavily masked with leaves. You can imagine what followed from what I told you. How I climbed the tree, and seated myself on the limb that ran along by the window, and pushing aside the leaves, looked in upon the scene believed by those engaged in it to be as absolutely unwitnessed as if it had taken place in the bowels of the earth.