For a while I hesitated as to whether I should explore the opening immediately; but soon came to the conclusion that I had better begin at once. So I went back to my bicycle and took the lamp with me. I had matches in my case, and as I had the revolver which I always carried now, I felt equal to any emergency. I think I was finally influenced in my decision to attempt the passage at once by the remembrance of Marjory's remark that the kidnappers would make no effort until their plans were quite complete. They, more than I, might fear discovery; and on this hope I was strong as I lowered myself down through the narrow opening. I was glad to see that there was no difficulty in moving the stone from the inside; there were two iron handles let into the stone for the purpose. I cannot say I was at ease in my mind, I was, however, determined to go on; and with a prayer to God for protection, and a loving thought of Marjory, I went on my way. The passage was doubtless of natural origin, for it was evident that the seams in the rock were much like those on the coast where the strata of different geological formations joined. Art had, however improved the place wonderfully. Where the top had come too low it had been quarried away; the remnants still lay adjacent where the cave broadened out. The floor where the slope was steep was cut into rough steps. Altogether, there were signs of much labour in the making of the passage. As I went down, I kept an eye on the compass whenever I came to a turn, so that I might have a rough idea of the direction in which I was going. In the main the road, with counterbalancing curves and angles, led straight down. When I had got to what I considered must be half way, allowing for the astounding magnitude which seems to be the characterisation of even a short way under ground; the passage forked, and at a steep angle another passage, lower and less altered than that along which I had come, turned away to the left. Going a few feet up it I could hear the sound of running water. This was evidently the passage to the reservoir. CHAPTER XXXI MARJORY'S ADVENTURE