I looked closely at Rouletabille and could not help smiling, on hearing this boy of eighteen talking of a man who had proved to the world that he was the finest police sleuth-hound in Europe.

“You smile,” he said; “you are wrong! I swear I will outwit him—and in a striking way! But I must make haste about it, for he has an enormous start of me—given him by Monsieur Robert Darzac, who is this evening going to increase it still more. Think of it!—every time the murderer comes to the château, Monsieur Darzac, by a strange fatality, absents himself and refuses to give any account of how he employs his time.”

“Every time the assassin comes to the château!” I cried. “Has he returned then—?”

“Yes, during that famous night when the strange phenomenon occurred.”

I was now going to learn about the astonishing phenomenon to which Rouletabille had made allusion half an hour earlier without giving me any explanation of it. But I had learned never to press Rouletabille in his narratives. He spoke when the fancy took him and when he judged it to be right. He was less concerned about my curiosity than he was for making a complete summing up for himself of any important matter in which he was interested.

At last, in short rapid phrases, he acquainted me with things which plunged me into a state bordering on complete bewilderment. Indeed, the results of that still unknown science known as hypnotism, for example, were not more inexplicable than the disappearance of the matter of the murderer at the moment when four persons were within touch of him. I speak of hypnotism as I would of electricity, for of the nature of both we are ignorant and we know little of their laws. I cite these examples because, at the time, the case appeared to me to be only explicable by the inexplicable,—that is to say, by an event outside of known natural laws. And yet, if I had had Rouletabille’s brain, I should, like him, have had a presentiment of the natural explanation; for the most curious thing about all the mysteries of the Glandier case was the natural manner in which he explained them.

I have among the papers that were sent me by the young man, after the affair was over, a note-book of his, in which a complete account is given of the phenomenon of the disappearance of the “matter” of the assassin, and the thoughts to which it gave rise in the mind of my young friend. It is preferable, I think, to give the reader this account, rather than continue to reproduce my conversation with Rouletabille; for I should be afraid, in a history of this nature, to add a word that was not in accordance with the strictest truth.

Chapter XV.
The Trap

(Extract from the Note-Book of Joseph Rouletabille)

“Last night—the night between the 29th and 30th of October—” wrote Joseph Rouletabille, “I woke up towards one o’clock in the morning. Was it sleeplessness, or noise without?—The cry of the Bête du Bon Dieu rang out with sinister loudness from the end of the park. I rose and opened the window. Cold wind and rain; opaque darkness; silence. I reclosed my window. Again the sound of the cat’s weird cry in the distance. I partly dressed in haste. The weather was too bad for even a cat to be turned out in it. What did it mean, then—that imitating of the mewing of Mother Angenoux’ cat so near the château? I seized a good-sized stick, the only weapon I had, and, without making any noise, opened my door.