CHAPTER XXIII
THE OLD WATER-GATE
This was very mysterious. Chippy could not make out what had happened. The boat had not sunk. Had it done so, the men would never have gone down without a sound. The scout thought a moment, then seized his sweep, and drove his skiff square across the river. Had the men gone out towards the middle? But Chippy opened fresh sweeps of the starlit stream, and all empty. Save for himself, there did not seem to be a single floating thing in the neighbourhood.
Now, in working across, Chippy had also gone down with the stream, so that by the time he was well out he had gained a point directly in front of the warehouse. He glanced towards the dark mass at the water's edge, and started. A pin-point of light flashed out at its base far below window or doorway. The light burned steadily for a few seconds, then went out as suddenly as it appeared.
'Looks to me as if some'dy struck a match over theer,' reflected Chippy. 'But who? The water looked empty enough. I'll have a look.'
He worked his boat round, and drove it steadily towards the great building, shaping his course a little upstream, in order to bring himself above it once more. He watched closely as he sculled, and when he checked his way not ten yards from the bank he was quite certain of two things: he had not seen the light again, and he had not seen any boat leave the front of the warehouse.
He let himself drift slowly down, staring and staring, and full of wonder. His eyes were now so used to the starshine on the river that he could see the water in front of the building like a smooth, pale plain, and it was empty—it was perfectly empty. Who had struck that light about the water-level? It was all very strange and mysterious.
Chippy let his craft drift. It moved slowly on the slow-running stream, but presently it was under the shadow of the lofty wall, and as it slid along, Chippy looked out more sharply than ever for the source of that strange light.
He stood in the stern of the boat drifting down in complete silence, with not even the gurgle of the sweep to betray his presence. And to this complete silence Chippy owed the discovery which he made about midway of the river-front.
He was staring straight at the blackness of the wall, when suddenly a light appeared in it. To his immense surprise, he found himself looking up a kind of long, arched tunnel, at whose farther end a man stood in a boat, a light in his hand. Only for an instant did Chippy behold this strange vision. His skiff drifted on, and he was faced once more by the darkness of the solid wall.