I had covered perhaps some thirty yards, and was just thinking of the hot whisky and water that I would order as soon as I got on board, when I suddenly became conscious of a quick shuffle of footsteps behind me. Before I could so much as blink an eyelash something dull and heavy came down with a sickening whack on the back of my head. The soft hat that I was wearing was driven down violently over my face, and, half-stunned by the blow, I stumbled forward on to my hands and knees.
What happened after that will always remain a trifle blurred. I have a vague impression of trying to scramble to my feet, and of receiving a violent shove which sent me sprawling sideways, with one arm and leg dangling over the edge of the parapet. I remember making a frantic clutch at the slippery stone in a vain effort to save myself; then the ground seemed to give way beneath me, and I went lurching wildly down through space into the black water below.
CHAPTER FOUR
I am a pretty good swimmer as people go, but when one is fully clothed and three parts dazed, a sudden plunge into a dirty dock is apt to prove a trifle disconcerting. I went under completely, and, although I struck out at once with the blind instinct of self-preservation, it was several moments before I managed to struggle back to the surface.
Fortunately for me my hat had come off in the fall, and, treading water with frantic energy, I was able to take a hasty survey of my position. Everything was more or less hidden by the mist, but a few yards away I could just make out the black face of the dock wall rising up dimly through the gloom.
If I hadn't been hampered by a sopping overcoat I could have covered the distance in two or three strokes. As it was, that cursed garment clung round my legs with a persistency that nearly finished off my career for good and all. Twice I was dragged under again entirely, and it was in a very exhausted state that I at last reached out a hand and grabbed hold of a slimy iron ring that was sticking out of the wall a foot or so above my head.
I was so utterly done that I could not have gone another foot. I just clung to this support, shaking the water out of my eyes, and gulping down mouthfuls of fresh air into my half-choked lungs. For all I knew the gentleman who had shoved me in might still be standing on the parapet above waiting to finish me off with a convenient brickbat, but for the moment I was too occupied in getting my breath to worry about him or anything else.
As that first feeling of suffocation passed off, however, the full extent of my danger suddenly came home to me. I realised with a sort of dull shock that nothing except the ring stood between me and death. If I once let go my hold I knew that I should sink like a stone, and, giddy and exhausted as I was, I could hardly expect my strength to last out for more than a few minutes.
Taking a firmer grip with both hands, I stared up desperately at the face of the wall. There was not much encouragement there, for the six feet of smooth and slippery concrete that met my eyes showed no trace of a crack throughout its entire surface. As far as I could see, I was trapped like a rat in a bucket, and for the first time in my life I felt a numbing chill of despair creeping through my heart.