As soon as it was light next morning Inspector Tanner let himself out of the hotel, and taking the sergeant’s bicycle, rode out along the London Road. It was again a perfect morning, everything giving promise of a spell of settled weather. The dew lay thick on the ground, sparkling in the rays of the rising sun, which cast long, thin shadows across the road. Not a cloud was in the sky, and though a few traces of mist still lingered on the river, they were rapidly disappearing in the growing heat. From the trees came the ceaseless twittering of birds, while from some unseen height a lark poured down its glorious song. The roads had dried up after the recent rains, but were not yet dusty, and as the Inspector pedalled along he congratulated himself on the pleasant respite he was likely to have from London in July. He crossed the Cranshaw River, and gradually diverging from it, rose briskly through the smiling, well-wooded country. About a mile from the town a grass-grown lane branched off to the left, leading, he presumed, back to the river at the Old Ferry. From it began the stone wall which bounded the Luce Manor grounds, and he passed first the small door at the end of the footpath from the house, and then the main entrance. A little farther, some two miles from the town, he reached the cross roads and, turning to the left and still skirting the Manor lands, arrived after a few minutes at the two-arched bridge which crossed the Cranshaw immediately above the falls. Here he hid the bicycle among some bushes, then stepping on to the bridge, he looked around. The river had greatly fallen, as he could see from the high water mark along the banks. But even now it was running fast, and swirled and eddied as it raced through the archways beneath. Below the falls the two distinct channels were visible, and Tanner could understand how objects passing through the right arch would almost inevitably get among the boulders and be smashed up, while those carried through the other might slip downstream uninjured. In the opposite direction the river curved away between thinly-wooded banks, and on those banks the Inspector decided his work must begin. From the medical evidence it had seemed clear to him that Sir William Ponson had first been murdered, the body afterwards being placed in the boat. With the ground in the soft condition produced by the recent rains, this could hardly have been done without leaving traces. He must therefore search for those traces in the hope of finding with them some clue to the murderer’s identity.