A hand reached back to make sure that I followed.  We appeared to be in a flagged passage under the main level of the house.  My hobnailed boots slipped on the floor, and I steadied myself on the wall, which seemed to be of undressed stone.  Mr Donne moved softly and assuredly, for he was better shod for the job than me, and his guiding hand came back constantly to make sure of my whereabouts.

I remember that I felt just as I had felt when on that August night I had explored the crevice of the Coolin—­the same sense that something queer was going to happen, the same recklessness and contentment.  Moving a foot at a time with immense care, we came to a right-hand turning.  Two shallow steps led us to another passage, and then my groping hands struck a blind wall.  The American was beside me, and his mouth was close to my ear.

‘Got to crawl now,’ he whispered.  ’You lead, mister, while I shed this coat of mine.  Eight feet on your stomach and then upright.’

I wriggled through a low tunnel, broad enough to take three men abreast, but not two feet high.  Half-way through I felt suffocated, for I never liked holes, and I had a momentary anxiety as to what we were after in this cellar pilgrimage.  Presently I smelt free air and got on to my knees.

‘Right, mister?’ came a whisper from behind.  My companion seemed to be waiting till I was through before he followed.

‘Right,’ I answered, and very carefully rose to my feet.

Then something happened behind me.  There was a jar and a bump as if the roof of the tunnel had subsided.  I turned sharply and groped at the mouth.  I stuck my leg down and found a block.

‘Donne,’ I said, as loud as I dared, ‘are you hurt?  Where are you?’

But no answer came.

Even then I thought only of an accident.  Something had miscarried, and I was cut off in the cellars of an unfriendly house away from the man who knew the road and had a plan in his head.  I was not so much frightened as exasperated.  I turned from the tunnel-mouth and groped into the darkness before me.  I might as well prospect the kind of prison into which I had blundered.

I took three steps—­no more.  My feet seemed suddenly to go from me and fly upward.  So sudden was it that I fell heavy and dead like a log, and my head struck the floor with a crash that for a moment knocked me senseless.  I was conscious of something falling on me and of an intolerable pressure on my chest.  I struggled for breath, and found my arms and legs pinned and my whole body in a kind of wooden vice.  I was sick with concussion, and could do nothing but gasp and choke down my nausea.  The cut in the back of my head was bleeding freely and that helped to clear my wits, but I lay for a minute or two incapable of thought.  I shut my eyes tight, as a man does when he is fighting with a swoon.

When I opened them there was light.  It came from the left side of the room, the broad glare of a strong electric torch.  I watched it stupidly, but it gave me the fillip needed to pick up the threads.  I remembered the tunnel now and the Kansas journalist.  Then behind the light I saw a face which pulled my flickering senses out of the mire.