I do not know how long we had walked; I only know that I had dozed and woke and dozed again whilst still automatically keeping pace with my comrade, when I was at last aroused by his coming to a dead stop. The rain had ceased, and although the moon was still obscured, the heavens had cleared somewhat, and I could see for a little distance in every direction. A huge white basin gaped in front of us, and I made out that it was a deserted chalk quarry, with brambles and ferns growing thickly all round the edges. My companion, after a stealthy glance round to make sure that no one was observing us, picked his way amongst the scattered clumps of bushes until he reached the wall of chalk. This he skirted for some distance, squeezing between the cliff and the brambles until he came at last to a spot where all further progress appeared to be impossible. 'Can you see a light behind us?' asked my companion. I turned round and looked carefully in every direction, but was unable to see one. 'Never mind,' said he. 'You go first, and I will follow.' In some way during the instant that my back had been turned he had swung aside or plucked out the tangle of bush which had barred our way. When I turned there was a square dark opening in the white glimmering wall in front of us. 'It is small at the entrance, but it grows larger further in,' said he. I hesitated for an instant. Whither was it that this strange man was leading me? Did he live in a cave like a wild beast, or was this some trap into which he was luring me? The moon shone out at the instant, and in its silver light this black, silent porthole looked inexpressibly cheerless and menacing. 'You have gone rather far to turn back, my good friend,' said my companion. 'You must either trust me altogether or not trust me at all.' 'I am at your disposal.' 'Pass in then, and I shall follow.' I crept into the narrow passage, which was so low that I had to crawl down it upon my hands and knees. Craning my neck round, I could see the black angular silhouette of my companion as he came after me. He paused at the entrance, and then, with a rustling of branches and snapping of twigs, the faint light was suddenly shut off from outside, and we were left in pitchy darkness. I heard the scraping of his knees as he crawled up behind me. 'Go on until you come to a step down,' said he. 'We shall have more room there, and we can strike a light.'