‘H’m,’ the sergeant mused, ‘seems reasonable.’ The sergeant knew more about sea currents than river. He had been brought up on the coast, and he had learnt that tidal currents having the same set will deposit objects at or about the same place. It seemed to him likely that a similar rule would apply to rivers. The body, boat, rudder, and bottom boards had all gone ashore at one place. The oars also were found not far apart, but they were a long way from the other things. What more likely than the boatman’s suggestion that the two lots of objects had become sufficiently divided in the upper reach to pass through different arches of the bridge? This would separate them completely enough to account for the positions in which they were found. Yes, it certainly seemed reasonable. And then another idea struck him, and he slapped his thigh. ‘By Jehosaphat, Cowan!’ he cried, ‘that’s just what’s happened, and it explains the only thing we didn’t know about the whole affair. Those oars went through the other arch right enough. And why? Why, because Sir William had lost them coming down the river. That’s why he was lost himself. I’ll lay you anything those oars got overboard, and he couldn’t find them in the dark.’ To the sergeant, who was not without imagination, there came the dim vision of an old, grey-haired man, adrift, alone and at night, in a light skiff on the swirling flood—borne silently and resistlessly onward, while he struggled desperately in the shrouding darkness to recover the oars which had slipped from his grasp, and which were floating somewhere close by. He could almost see the man’s frantic, unavailing efforts to reach the bank, almost hear his despairing cries rising above the rush of the waters and the roar of the fall, as more and more swiftly he was swept on to his doom. Almost he could visualise the tossing, spinning boat disappear under the bridge, emerge, hang poised as if breathless for the fraction of a second above the fall, then with an unhurried, remorseless swoop, plunge into the boiling cauldron below. . . . A horrible fantasy truly, but to the sergeant it seemed a picture of the actual happening. But why, he wondered, had both the oars taken the other arch? It would have been easier to explain the loss of one. With an unskilful boatman such a thing not unfrequently occurred. But to lose both involved some special cause. Possibly, he thought, Sir William had had some sudden start, had moved sharply, almost capsizing the boat, and in making an involuntary effort to right it had let go with both hands. He was still puzzling over the problem when a note was handed him which, when he had read it, banished the matter of the oars from his mind, and turned his thoughts into a fresh direction. It ran: Luce Manor, Thursday.—Please come out here at once. An unfortunate development has arisen.—Walter Ames.