He did this because his quick eye had seen a black head bobbing in the water below the wharf. The swimmer was evidently making for the near shore. Rupert did not know if it was Tung-yu or Hwei, but hurried at top speed along the bank, in the hope of catching the man when he came ashore. He sped along a kind of narrow way, for here, the old houses of Rotherhithe came down, almost to the water's edge. There were lights in some of the windows, but for the most part, these were in darkness. To Rupert's left, loomed the house, and on his right was the river bank, shelving down to the glittering water. A few piles ran out into the stream, and as the river was low, there were acres of evil-smelling mud. The man was making for the bank and battling hard against the stream, which was sweeping him down. Rupert shouted, and seeing him on the bank, the swimmer seemed to stop, apparently dreading the reception he would get. Finally he resumed his stroke, and made for a wharf, some distance down. Ainsleigh ran for this, but was stopped by a wooden fence. He managed to climb over, and raced on to the wharf; but the swimmer was nowhere to be seen. Suddenly, Rupert caught sight of a figure crawling up the bank a little distance below, and again ran up the wharf to the pathway. The man who had landed caught sight of him, and leaping on to the hard path, ran along the river bank, but in a swaying manner, as though his powers of endurance were exhausted. Considering how hard he had battled with the current, probably the man's strength had given out and Rupert, feeling fresh and fit, thought he would have no difficulty in catching up. But the man ran hard, and then dropped out of sight below the bank. Apparently he had taken to the river again. Rupert raced down so quickly, as to overshoot the mark, where the man had slipped down. While looking round, he caught sight of him again. He ran up the bank and dodged into a narrow side street. Rupert was after him in a moment. The man had vanished round a corner--so Ainsleigh thought--but when Rupert came after, he saw the street in the moonlight was perfectly empty, and turned back. The fugitive had tricked him, by dodging into a dark corner, and was again on the bank. He leaped on the wharf, and scrambled down the piles to a boat which swung at the end of a long rope. While he hauled this in painfully, and pantingly, Rupert leaped on him. The man looked up with an oath, and closed with his pursuer. It was Burgh. "The papers--the papers," gasped Rupert, "you give them up."