"Well, let's hear how you get on," he said, giving me his hand, "and if I can be of the slightest use to you in any way don't hesitate to let me know. That's the only excuse for a lawyer's existence." I thanked him once more with a gratitude that was entirely genuine, and, feeling how extraordinarily lucky I was to have dropped across such a good friend just when I needed him, I turned up my collar and set out again on my return journey to Charing Cross. A clammy, drizzling mist still pervaded everything, but, disdaining a cab in my present high spirits, I strode briskly along over the wet pavements. My inward cheerfulness must to some extent have been reflected in my face, for on two occasions I noticed a draggled-looking passer-by glance rather curiously at me, as though he wondered what on earth I could find to be so happy about on such a damnable afternoon. When I reached the station I found that my luck was still in. The train I wanted was standing at the platform, and a minute later I was being whirled eastwards in the comfortably padded seat of a half-empty smoker. It had certainly been a well-arranged and satisfying day. A short walk from Mark Lane, where I got out, brought me to the Docks entrance. The fog here was thicker than ever, and a general air of murky desolation showed that work for the day had come to a compulsory standstill. I had taken my bearings in the morning, however, and, without much fear of missing my way, I struck out into the uninviting gloom. On the near side of where the _Neptune_ was lying there was a long stretch of empty dock, with a tall, double lamp-post guarding its extreme point. I made this landmark safely, and, keeping the edge of the basin in view on my right, I advanced carefully along the wet cobblestones. 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