After my examination of the flues in the morning, I had dismissed them from my mind, and this extraordinary behavior of the library fireplace astounded me. It is not in reason that a perfectly normal fireplace, built in the most approved fashion, and with chimneys that rise into as clear an ether as October can bestow, could act so monstrously without the intervention of some malign agency. We had discussed all the possibilities the previous night, and I was not anxious to hear further lay opinions. The chimney's conduct was annoying, the more so that to my professional sense it was inexplicable. Lord Arrowood had retreated discreetly toward the door, and the others had risen and stood close behind Cecilia, whose gaze was bent rather accusingly upon me. A dark thought had crossed my mind. As our eyes met, I felt that she had read my suspicions and did not wholly reject them. Henderson was valiantly poking the logs, while one or two of the other men gave him the benefit of their advice. I crossed the hall to the drawing-room, but no one was there. I went back to the billiard-room, but saw nothing of Miss Octavia. Cecilia had rung for the footman, and I passed him in the hall on his way to answer her summons. I stopped him with an inquiry on my lips; but I could not ask the question; even in my perplexity as to the cause of the chimney's remarkable performances I did not so far forget myself as to communicate my suspicion to a servant. "Nothing, Thomas," I said; and the man passed on. It was possible, of course, that Miss Octavia knew more than she cared to tell about the erratic ways of the library chimney, or she might indeed be the cause of its vagaries. Sufficient time had elapsed after her retirement from the library to allow her to gain the roof and clap a stopper on the chimney-pot. This did not however account for the fact that on the previous evening she had been present in the library when the same chimney had manifested a similar sulkiness. I was still pondering these things when I heard loud laughter from the library, and on returning found the logs again blazing in the fireplace, from which the smoke rose demurely in the flue. "This fireplace is like a geyser, Mr. Ames," said Cecilia, "and spurts smoke at regular intervals. As I remember, the clock on the stair was striking nine last night when the smoke poured out, and there--it is striking nine now!" She tossed her head slightly; and this was, I thought, in disdain of the suspicion that must still have shown itself a little stubbornly in my face. I withdrew again in a few minutes, and followed the great chimney's course upward. Miss Octavia's apartments were at the front of the house, her sitting-room windows looking out upon the Italian garden. Her doors were closed, but I knew from my examination in the morning that the flue of her fireplace tapped the chimney that rose from the drawing-room, and had nothing whatever to do with the library chimney.