Down the stairway into the lower hall, across the refectory, where the great frescoed Crucifixion flared into sudden clearness under the fitful lightning, out into the silent cloister. It was very dark. I stumbled along the heaving bricks, now guiding myself by a hand on the whitewashed wall, now by a touch on a column wet with the storm. From all the eaves the rain was dripping on to the pebbles at the foot of the arcade: a pigeon, startled from the capital where it was sleeping, beat its way into the cloister close. Still the white thing drifted before me to the farther side of the court, then along the cloister at right angles, and paused before one of the many doorways that led to the cells. A sudden blaze of fierce lightning, the last now of the fleeting trail of storm, leaped around us, and in the vivid light I saw the white face turned again with the look of overwhelming desire, of beseeching pathos, that had choked my throat with an involuntary sob when first I saw Sister Maddelena. In the brief interval that ensued after the flash, and before the roaring thunder burst like the crash of battle over the trembling convent, I heard again the sorrowful words, "I cannot sleep," come from the impenetrable darkness. And when the lightning came again, the white figure was gone. I wandered around the courtyard, searching in vain for Sister Maddelena, even until the moonlight broke through the torn and sweeping fringes of the storm. I tried the door where the white figure vanished: it was locked; but I had found what I sought, and, carefully noting its location, went back to my room, but not to sleep. In the morning the Cavaliere asked Rendel and me which of us had seen the ghost, and I told him my story; then I asked him to grant me permission to sift the thing to the bottom; and he courteously gave the whole matter into my charge, promising that he would consent to anything. I could hardly wait to finish breakfast; but no sooner was this done than, forgetting my morning pipe, I started with Rendel and the Cavaliere to investigate. "I am sure there is nothing in that cell," said Valguanera, when we came in front of the door I had marked. "It is curious that you should have chosen the door of the very cell that tradition assigns to Sister Maddelena; but I have often examined that room myself, and I am sure that there is no chance for anything to be concealed. In fact, I had the floor taken up once, soon after I came here, knowing the room was that of the mysterious Sister, and thinking that there, if anywhere, the monastic crime would have taken place; still, we will go in, if you like." He unlocked the door, and we entered, one of us, at all events, with a beating heart. The cell was very small, hardly eight feet square. There certainly seemed no opportunity for concealing a body in the tiny place; and although I sounded the floor and walls, all gave a solid, heavy answer,--the unmistakable sound of masonry.