‘I want you,’ he said, ‘to find the man who made those tracks. You need not mind about the Manor people, I shall attend to them. Get round the country, and make inquiries in the neighbouring towns and villages. Particularly work the railway stations and garages. The man will be small, and of the working classes in all probability, and he will certainly have had very wet and muddy boots and trousers on account of walking through the stream. It’s not conclusive, but the fact that he missed the stepping-stones by so great a distance, points to his being a stranger to the locality. But in any case he shouldn’t be hard to trace. Keep in touch with me through the Halford police station.’ That afternoon and the next morning the Inspector saw all the other servants at Luce Manor, both indoor and out, but here again without result. In the case of the men he took prints from their boots to compare with those he had found on the river bank. This was a tedious operation, involving troublesome explanations and reassurances, but at last it was done, and Tanner was able to say with certainty that three of the four men who had walked together were the butler, the valet, and the gardener, while the tracks of the fifth man, who had stood in the boathouse, were not made by anyone belonging to the estate. It was probable, therefore, that this fifth man was concerned in the tragedy, and Tanner was glad he had lost no time in setting Sergeant Longwell to work to trace him. In the afternoon the Inspector called at Austin’s villa, and interviewed first Lady Ponson, and secondly Enid. Apologising courteously for his intrusion, he questioned both ladies on all the points about which he was in doubt, but once more without gaining any fresh information. Both had noticed Sir William had not been quite up to his usual form for a few days before their departure for London, but both had put it down to some trifling physical indisposition, and neither could throw light on any possible cause of worry to him. Asked if he had an enemy who might have been giving him annoyance, they emphatically negatived the suggestion, saying that as far as they knew Sir William had been universally beloved. As they had been in London on the night in question, they of course knew nothing of the actual details of the tragedy. Inspector Tanner was sure from the bearing and manner of both ladies that they were telling him the absolute truth, and really were ignorant of anything which might have been at the bottom of the affair. They clearly were terribly shocked and distressed, and he made his interview as short as possible.