"That is as it may be," I answered shortly; "but we certainly shall not find out by stopping here. My business is to get to the bottom of this, and I am going to do it. That there is danger of some sort, I have very little doubt; but danger or not, I am going down." "If you'll be warned by me, sir, you'll just stay quietly here." "I must go down and see the matter out," was my answer. "Now listen to me, Henderson. I see that you are alarmed, and I don't wonder. Just stay quietly where you are and watch, but if I call come at once. Don't delay a single instant. Remember I am putting my life into your hands. If I call 'Come,' just come to me as quick as you can, for I may want help. Give me that lantern." He unhitched it from the wall, and taking it from him, I walked cautiously down the steps on to the line. I still felt curiously, unaccountably drowsy and heavy. I wondered at this, for the moment was such a critical one as to make almost any man wide awake. Holding the lamp high above my head, I walked rapidly along the line. I hardly knew what I expected to find. Cautiously along the metals I made my way, peering right and left until I was close to the fatal spot where the bodies had been found. An uncontrollable shudder passed over me. The next moment, to my horror, without the slightest warning, the light I was carrying went out, leaving me in total darkness. I started back, and stumbling against one of the loose boulders reeled against the wall and nearly fell. What was the matter with me? I could hardly stand. I felt giddy and faint, and a horrible sensation of great tightness seized me across the chest. A loud ringing noise sounded in my ears. Struggling madly for breath, and with the fear of impending death upon me, I turned and tried to run from a danger I could neither understand nor grapple with. But before I had taken two steps my legs gave way from under me, and uttering a loud cry I fell insensible to the ground. * * * * * Out of an oblivion which, for all I knew, might have lasted for moments or centuries, a dawning consciousness came to me. I knew that I was lying on hard ground; that I was absolutely incapable of realising, nor had I the slightest inclination to discover, where I was. All I wanted was to lie quite still and undisturbed. Presently I opened my eyes. Some one was bending over me and looking into my face. "Thank God, he is not dead," I heard in whispered tones. Then, with a flash, memory returned to me. "What has happened?" I asked. "You may well ask that, sir," said the Inspector gravely. "It has been touch and go with you for the last quarter of an hour; and a near thing for me too." I sat up and looked around me. Daylight was just beginning to break, and I saw that we were at the bottom of the steps that led up to the signal-box. My teeth were chattering with the cold and I was shivering like a man with ague. "I am better now," I said; "just give me your hand."