That night, just after dark, Theodore Racksole embarked with his new friend George Hazell in one of the black-painted Customs wherries, manned by a crew of two men--both the later freemen of the river, a distinction which carries with it certain privileges unfamiliar to the mere landsman. It was a cloudy and oppressive evening, not a star showing to illumine the slow tide, now just past its flood. The vast forms of steamers at anchor--chiefly those of the General Steam Navigation and the Aberdeen Line--heaved themselves high out of the water, straining sluggishly at their mooring buoys. On either side the naked walls of warehouses rose like grey precipices from the stream, holding forth quaint arms of steam-cranes. To the west the Tower Bridge spanned the river with its formidable arch, and above that its suspended footpath--a hundred and fifty feet from earth. Down towards the east and the Pool of London a forest of funnels and masts was dimly outlined against the sinister sky. Huge barges, each steered by a single man at the end of a pair of giant oars, lumbered and swirled down-stream at all angles. Occasionally a tug snorted busily past, flashing its red and green signals and dragging an unwieldy tail of barges in its wake. Then a Margate passenger steamer, its electric lights gleaming from every porthole, swerved round to anchor, with its load of two thousand fatigued excursionists. Over everything brooded an air of mystery--a spirit and feeling of strangeness, remoteness, and the inexplicable. As the broad flat little boat bobbed its way under the shadow of enormous hulks, beneath stretched hawsers, and past buoys covered with green slime, Racksole could scarcely believe that he was in the very heart of London--the most prosaic city in the world. He had a queer idea that almost anything might happen in this seeming waste of waters at this weird hour of ten o’clock. It appeared incredible to him that only a mile or two away people were sitting in theatres applauding farces, and that at Cannon Street Station, a few yards off, other people were calmly taking the train to various highly respectable suburbs whose names he was gradually learning. He had the uplifting sensation of being in another world which comes to us sometimes amid surroundings violently different from our usual surroundings. The most ordinary noises--of men calling, of a chain running through a slot, of a distant siren-- translated themselves to his ears into terrible and haunting sounds, full of portentous significance. He looked over the side of the boat into the brown water, and asked himself what frightful secrets lay hidden in its depth. Then he put his hand into his hip-pocket and touched the stock of his Colt revolver--that familiar substance comforted him.