But the boat rattled and gurgled along, past the Island, and past the ferry, till they were level with the brewery, by the bend. The bend here made at one side a large stretch of slack water where the tide moved hardly at all. By the other bank the tide raced narrowly down. Here, John thought, was the place for his purpose. So for a long hour he steered the boat back and forth from bank to bank, peering intensely through the rain. Sometimes he saw a log or a basket or a broken bottle scurrying dimly past and chased it with a wild hope downstream. Once he made sure that he had found what he had sought--a light object floating high out of the water; this he followed half-way down the Island. And when he found it it was a dead cat--a light-coloured cat. "The yellow cat," he thought. Once, as he headed obliquely across the river, boathook in hand, a black invisible police-boat shot surprisingly across his bows. A curse came out of the gloom and a lamp was flashed at him. The police-boat put about and worked back alongside; a heavy man in a cape asked him what the hell he was doing, charging about without a light. John might have asked the same question, but he was too frightened. He apologized and said he had let go of the rudder line to do something to the engine. The policemen went on again, growling. Then the tugs began to come down, very comforting and friendly, their lights gliding mistily through the wet. John had to be careful then, and creep upstream along the bank while their long lines of barges swung ponderously round the corner. And how could he be sure that Emily was not slipping past him in mid-stream, as he did so? It was hopeless, this. The wind got up--a chilly wind from the East. He was cold and clammy and terribly alone. The rain had crept under his shirt and up his sleeves; his trousers hung about his ankles, heavy with rain. He wanted to go home; he wanted to get out of the horrible wet boat; he was tired. But he had promised. Stephen was his best friend, and Stephen had appealed to him. He had done a bad thing, but he was still Stephen. And he, John, was mixed up in it now. If Emily was found at Putney in the morning, his own story would have to be told. Not a good story, either, whatever his motives had been. What _had_ his motives been? Margery Byrne, chiefly, of course. Well, she was still a motive--very much so.