I profited by the fact that I was not on guard to go to my room for a little rest; but I slept badly and dreamed that Old Bob, M. Rance and Mme. Edith had formed themselves into a band of brigands who had sworn death to Rouletabille and myself. And when I awakened under this pleasant impression and saw the old towers and the old château with their menacing walls rising before me, I came near thinking that my nightmare was real and I said to myself half aloud: “It’s a fine place in which we have taken refuge!” I put my head out of the window. Mrs. Edith was walking in the Court of the Bold, chatting carelessly with Rouletabille and twisting the stem of a beautiful rose between her pretty fingers. I went down immediately. But when I reached the court, I found no one there. I followed Rouletabille whom I saw on his way to make his inspection of the Square Tower. I found him quite calm and entirely master of himself--and also, entirely the master of his eyes, which were not closed now but open wide and keenly on the watch for anything that might turn up. Ah, it was worth while to see the manner in which he looked at everything around him! Nothing escaped him. And the Square Tower, the abode of the Lady in Black, was the object of his constant surveillance. And at this point, it seems to me opportune, a few hours before the moment at which that most mysterious attack occurred, to present to the reader the interior plan of the inhabited story of the Square Tower--the story which was on a level with the Court of Charles the Bold. When one entered the Square Tower by the only door (K) one found himself in a large corridor which had previously formed a part of the guard room. The guard room had formerly taken up all the space at O, O′, O″ and O‴ and was shut in by walls of stone which still existed with their doors opening upon the other rooms of the Old Castle. It was Mrs. Arthur Rance who in this guard room had had wooden partitions raised to make quite a large room which she wished to use for a bathroom. This room, also, was now surrounded by the two passages at right angles to each other. The door of the room which served as the lodge of the Berniers was situated at S. It was necessary to pass in front of this door to reach R, where was the only door affording admission to the apartment of the Darzacs. One or other of the Berniers was always in the lodge. And no one save themselves had a right to enter it. From this lodge one could easily see from a little window at Y, the door V which opened off the suite of Old Bob. When M. and Mme. Darzac were not in their apartment, the only key which opened the door R was in the keeping of the Berniers; and it was a special kind of key made purposely for the room within the last twenty-four hours in a place which no one but Rouletabille knew. The young reporter had let no one into the secret.