Those who have accompanied me thus far may not have forgotten the account of my first night at Dupley Walls, nor how frightened I was by the sound of certain mysterious footsteps in the room over mine. The matter was explained simply enough by Dance next day as a whim of Lady Pollexfen, who, for some reason best known to herself, chose that room out of all the big old house as the scene of her midnight perambulations. When therefore, on one or two subsequent occasions, I was disturbed in a similar way, I was no longer frightened, but only rendered sleepless and uncomfortable for the time being. I felt at such times, so profound was the surrounding silence, as if every living creature in the world, save Lady Pollexfen and myself, were asleep.
But before long that room over mine acquired for itself in my mind a new and dread significance. A consciousness gradually grew upon me that there was about it something quite out of the common way; that its four walls held within themselves some grim secret, the rites appertaining to which were gone through when I and the rest of the uninitiated were supposed to be in bed and asleep. I cannot tell what it was that first made me suspect the existence of this secret. Certainly not the midnight walks of Lady Pollexfen. Perhaps a certain impalpable atmosphere of mystery, which, striking keenly on the sensitive nerves of a child, strung by recent events to a higher pitch than usual, broke down the first fine barrier that separates things common and of the earth earthy, from those dim intuitions which even the dullest of us feel at times of things spiritual and unseen. But however that may be, it so fell out that I, who at school had been one of the soundest of sleepers, had now become one of the worst. It often happened that I would awake in the middle of the night, even when there was no Lady Pollexfen to disturb me, and would so lie, sleepless, with wide-staring eyes, for hours, while all sorts of weird pictures would paint themselves idly in the waste nooks and corners of my brain. One fancy I had, and for many nights I thought it nothing more than fancy, that I could hear soft and muffled footsteps passing up and down the staircase just outside my door; and that at times I could even faintly distinguish them in the room over mine, where, however, they never stayed for more than a few minutes at any one time.
In one of my daylight explorations about the old house I ventured up the flight of stairs that led from the landing outside my door to the upper rooms. At the top of these stairs I found a door that differed from every other door I had seen at Dupley Walls. In colour it was a dull dead black, and it was studded with large square-headed nails. It was without a handle of any kind, but was pierced by one tiny keyhole. To what strange chamber did this terrible door give access? and who was the mysterious visitor who came here night after night with hushed footsteps and alone? These were two questions that weighed heavily on my mind, that troubled me persistently when I lay awake in the dark, and even refused by day to be put entirely on one side.
By-and-by the mystery deepened. In a recess close to the top of the flight of stairs that led to the black door was an old-fashioned case clock. When this clock struck the hour two small mechanical figures dressed like German burghers of the sixteenth century came out of two little turrets, bowed gravely to each other, and then retired, like court functionaries, backwards. It was a source of great pleasure to me to watch these figures go through their hourly pantomime. But after a time it came into my head to wonder whether they did their duty by night as well as by day, whether they came out and bowed to each other in the dark, or waited quietly in their turrets till morning. In pursuance of this inquiry I got out of bed one night after Dance had left me, and relighted my candle. I knew that it was just on the stroke of eleven, and here was a capital opportunity for studying the customs of my little burghers by night. I stole up the staircase with my candle, and waited for the clock to strike. It struck, and out came the figures as usual.
"Perhaps they only came out because they saw my light," I said to myself. I felt that the question as to their mode of procedure in the dark was still an unsettled one.
But scarcely had the clock finished striking when I was disturbed by the shutting of a door downstairs. Fearing that some one was coming, and that the light might betray me, I blew out my candle and waited to hear more. But all was silent in the house. I turned to go down, but as I did so I saw with astonishment that a thin streak of light shone from under the black door. I stood like one petrified. Was there any one inside the room? Listening intently, I waited for full five minutes without stirring a limb. Silence the most profound upstairs and down. Stepping on tiptoe, I went back to my room, shut myself in, and crept gladly into bed.
Next night my curiosity overmastered my fear. As soon as Dance was gone I crept upstairs in the dark. One peep was enough. As on the previous night, a thin streak of light shone from under the black door--evidence that it was lighted up inside. Next night, and for several nights afterwards, I put the same plan in operation with precisely the same result. The light was always there.
Having my attention thus concentrated as it were upon this one room, and lying awake so many hours when I ought to have been asleep, my suspicions gradually merged into certainty that it was visited every midnight by some one who came and went so lightly and quietly that only by intently listening could I distinguish the exact moment of their passing my door. Who was this visitor that came and went so mysteriously? To discover this, without being myself discovered, was a matter that required both tact and courage, but it was one on which I was almost as much a monomaniac as a child well can be. To have opened my door when the landing was perfectly dark would have been to see nothing. To have opened the door with a candle in my hand would have been to betray myself. I must wait for a moonlight night, which would light up the landing sufficiently for my purpose. I waited. My opportunity came. With my doorway in deep shadow, my door just sufficiently open for me to peer through, and with the staircase lighted up by the rays of the moon, I saw and recognised the mysterious midnight visitor to the room over mine. I saw and recognised Sister Agnes.