He continued his search of the bank, seeing no traces of an approach to the river, but finding here and there prints of the four men going downstream, and of the fifth leading in both directions. About a hundred yards before he reached the boathouse a paling went up at right angles to the river, separating the rough, uncared for bank along which he had passed from the well-kept lawn he was approaching. The grass on this latter was cut short, and looking up under the fine oaks and beeches studded about, he could see the façade of the house. A gravel path connected the two buildings, leading from the Dutch garden in front of the terrace straight down to the door of the boathouse. From the latter point another path branched off at right angles to the first, running upstream along the river bank. This, Tanner remembered from his examination of the map, afterwards curved round to the left, and joined the narrow walk from the house at the road gate. A third short path ran round the boathouse, and terminated in a flight of broad landing steps, leading down into the river. A careful search of the ground near the boathouse revealed occasional impressions on the closely cut sward. The Inspector spent over an hour moving from point to point, and was at last satisfied as to what had taken place. The four men whom he had assumed were Austin and the servants, had evidently come down the path from the direction of the house. They had turned to the right before reaching the boathouse, thus approaching the river diagonally, and had crossed the paling bounding the lawn close to the water’s edge. These men had walked together and the tracks were exactly in accordance with the statement of their movements they had made to the sergeant. The fifth man had crossed the paling almost at the same place as the others—it was the obviously suitable place—but instead of turning up towards the house, his steps led direct to the boathouse! Another line of the same steps led back from the boathouse to the fence—in neither case continuously, but here and there, where the grass was thin. And at two points along these tracks the Inspector gave a chuckle of satisfaction. At one there was a perfect impression of part of the right sole, and at another of the remainder and the heel. Tanner decided he must take plaster casts of these prints before they became blurred. [Illustration: A ground plan of a boathouse situated on the bank of River Cranshaw, with two different sets of footprint tracks passing nearby.]