"I should like to see it, immensely," I answered, wondering what on earth, in the nature of a novelty, such a man could have to show me. "Come," he said in the same tone, linking his arm in mine. "I will show it to you now. As I say, I have no fear at all that you will betray me, yet there isn't another living person, excepting my own accomplices, I would take where I am going to take you now." Down the side street he had just come up I followed him. We turned to the right again, then to the left. A little further on he stopped at a greengrocer's shop, a small, insignificant shop with one window only. "Wait here," he said as he entered. A minute later he reappeared and beckoned to me. "My friend," he said, presenting me to a cadaverous man of middle age, with a thin, prominent, rather hooked nose, high cheek-bones, and curious eyes of a steely grey, which bushy eye-brows partly concealed. The man looked at me keenly, but he neither smiled nor spoke, nor did he offer to shake hands. We were now inside the shop. Quickly we passed into an inner room, and thence to a room beyond it. This room was lined apparently with bookshelves. Advancing to a corner of it, after carefully locking the door, the cadaverous man, standing on tiptoe, pressed what appeared to be a book in the topmost shelf. At once a door in the bookshelves opened. In silence we followed him through it, and the door shut noiselessly behind us. I suppose we had walked ten or twelve yards along the narrow, low-ceilinged, uncarpeted passage, lit only by the candle lantern that our guide had unhooked from a nail in the wall, when he suddenly stopped and bent down. Now I saw that he was lifting the boards, one after another. A few moments later the upper rungs of a ladder became visible. Francois descended, I followed carefully—I counted fifteen rungs before I reached the ground—and the gaunt man came after me, shifting the boards back into position above his head when he was half-way down the ladder. The darkness here was denser than it had been in the passage above, but the lantern served its purpose. We were in a much narrower passage now, so low that we had to stoop to make our way along it. The ceiling was roughly hewn, so was the ground we walked upon. Half a dozen steps along the rough ground and we stopped again. Facing us was a low, extremely narrow door, apparently an iron door—it resembled the door of a safe. Fitting a key into it, the gaunt man pushed it open, and one by one we entered.