I + 

Anthony was still in the garden. Anthony had found something. Clouds of pipe-smoke hung round his head in the hot, still air. Anthony was thinking. + 

He was alone. Boyd, indefatigable, had gone at once into the house, bent upon another orgy of shrewd questioning. This time his questions would have, in the light of what the study had told, a more definite bearing. + 

What Anthony had found were two sets, some eighteen inches apart, of four deep, round impressions of roughly the size of a sixpence. They were in the broad flowerbed which ran the whole length of the study wall and were directly beneath the sill of the most easterly of the three windows⁠—the farther closed window, that is, from the open one through which it seemed that the murderer must have effected entrance to the study. The flowerbed, Anthony noticed, was unusually broad⁠—so broad, in fact, that any person, unless he were a giant, wishing to climb into any of the three windows, would perforce tread, with one foot at least, among the flowers. + 

He stooped to examine his find. Whoever, in the absence of Mr. Diggle the gardener, had so lavishly watered the flowerbed on the previous day received his blessing. Had the soil not been so moist, those holes would not have been there. + 

Anthony thought aloud: “Finger-holes. Just where my fingers would go if I was a good deal narrower across the shoulders and squatted here and tried to look into the room without bringing either of my feet on to the bed.” + 

He stepped deliberately on to the flowerbed and bent to examine the low sill of the window. There was a smudge on the rough stone. It might be a dried smear of earthy fingers. On the other hand, it might be almost anything else. But as he straightened his back a bluish-black gleam caught his eye. + 

He investigated, and found, hanging from a crevice in the rough edge of the sill, a woman’s hair. It was a long hair, and jet black. + 

“That explains the closeness of those fingermarks,” he muttered. “A woman in the case, eh? Now, why was she here, in front of the closed window? And was she here last night? Or this morning, quite innocent like? The odds are it was last night. One doesn’t crouch outside a Cabinet Minister’s window in daylight. Nor at all, unless one’s up to no good. No, I think you were here last night, my black beauty. I love little pussy, her hair is so black, and if I don’t catch her she’ll never come back. Now where did you come from, Blackie dear? And have you left any other cards? O, Shades of Doyle! What a game!” + 

He stepped back on to the path and knelt to examine the stone edging to the flowerbed. In the position she must have been in, the woman would most probably, he argued, have been on one knee and had the foot of the other leg pressed vertically against this edging. + 

She had; but Anthony was doubly surprised at what he found. For why, in this dry weather, should the mark of her foot be there at all? And, as it was there, why should it look like a fingerprint a hundred times enlarged? + 

He scratched his head. This was indeed a crazy business. Perhaps he was off the rails. Still, he’d better go on. This all might have something to do with the case. + 

More closely he examined this footprint that was like a fingerprint. Now he understood. The mark had remained because the peculiar sole of this peculiar shoe had been wet and earthy. There had been no rain for a week. Why was the shoe wet? And why⁠—he looked carefully about⁠—were there no other such marks on the flagstones of the path? Ah, yes; that would be because in ordinary walking or running the peculiar shoes did not press hard enough to leave anything but a wet patch which would quickly dry. Whereas, in pressing the sole of the foot against that edging to the flowerbed, much more force would have to be used to retain balance⁠—sufficient force to squeeze wet clayish earth out in a pattern from that peculiar sole. + 

But what about the wetness? He hadn’t settled that. Suddenly his mind connected the peculiarity of that imprint with the idea of water. A rope-soled sandal. When used? Why, bathing. Here Anthony laughed aloud. “Sleuth, you surpass yourself!” he murmured. “Minister murdered by Bathing Belle⁠—only not at the seaside! Cock Robin’s murderer not Sparrow as at first believed, but one W. Wagtail! Gethryn, you’re fatuous. Take to crochet.” + 

He started for the verandah door. Halfway he stopped, suddenly. He’d forgotten the river. But the idea was ridiculous. But, after all⁠—well, he’d spend ten minutes on it, anyhow. Now, to begin⁠—assuming that the woman had come out of the river and had wanted (strange creature!) to get back there⁠—he would work out her most probable route and follow it. If within five minutes he had found no more signs of her, he’d stop. + 

After a moment’s calculation he started off, going through the opening in the yew hedge, down the grass bank to his right and then crossing the rose garden at whose far side there began a pergola. + 

At the entrance to the pergola he found, caught round a thorny stem of the rose-creeper that fell from the first crosspiece of the archway, four long black hairs. + 

Anthony controlled his elation. These might not, he thought, be from the same head. But all the same it was encouraging. It fitted well. Running in the dark and a panic, she hadn’t ducked low enough. He could see her tearing to free her hair. Well, he’d get on. But really this mad idea about swimming women couldn’t be true. + 

From the other end of the pergola he emerged on to a lawn, its centre marked by a small but active fountain. A gravelled path, along which he remembered having walked up to the house, ran down at the right of the grass to the gate on the riverbank through which he had entered. He paused to consider the position; then decided that one making in a hurry for the gate would cut across the grass. + 

He found confirmation. Round the fountain’s inadequate basin was a circle of wet grass, its deep green in refreshing contrast to the faded colour of the rest. At the edge of the emerald oasis were two indistinct imprints of the sandal and its fellow, and two long smeared scars where the grass had been torn up to expose the soil beneath. Farther on, but still within the circle, were two deeper, round impressions; beyond them, just where the wet grass ended, was another long smear. + 

Anthony diagnosed a slip, a stagger, and a fall. Not looking for more signs⁠—he had enough⁠—he hurried on to the little gate. The other side of it, on the path which ran alongside the blustering pygmy of a river, he hesitated, looking about him. Again he felt doubt. Was it likely that anyone would swim the Marle at night? Most decidedly it was not. In the first place there was, only some three hundred and fifty yards or so downstream to his right, a perfectly good bridge, which joined the two halves of the village of Marling. In the second place, the Marle, though here a bare twenty yards wide, seemed as uncomfortable a swim as could well be, even for a man. Always turbulent, it was at present actually dangerous, still swollen as it was by the months of heavy rain which had preceded this record-breaking August. + 

“No!” said Anthony aloud. “I’m mad, that’s what it is. But then those are bathing sandals. And didn’t I just now tell Boyd he was making a mistake in not treating this business like the goriest of ’tec tales?” + 

He stood looking over the river. If only he could fit any sort of reason⁠— + 

One came to him. He laughed at it; but it intrigued him. It intrigued him vastly. There was a house, just one house, on the opposite bank. It was perhaps thirty yards higher up the stream than the gate by which he was standing. + 

Suppose someone from that house wanted to get to Abbotshall quickly, so quickly that they could not afford to travel the quarter-mile on each side of the river which crossing by the bridge would involve. Taking that as an hypothesis, he had a reason for this Captain Webb business. The theory was insane, of course, but why not let fancy lead him a while? + 

The very fact that the woman was so good a swimmer as she must be, made it probable that she would be sufficiently water-wise to make use of, rather than battle helplessly against, the eight-mile-an-hour stream. Very well, then, before taking to the river, on her way back she would have run upstream along this bank to a point some way above the house she wished to return to on the opposite bank. + 

Still laughing at himself, Anthony turned to his left and walked upstream, his eyes on the soft clay at the river’s edge. When he had passed by fifty yards the house on the other side, he found two sandal-marks. They were deep; the clay gave a perfect impression. + 

He was surprised but still unbelieving. Then, as he stood for a moment looking down into the dark water only a few inches below the level of his feet, a gleam of white caught his eye. Curious, he squatted, pulled up his sleeve and thrust his arm into the water, groping about the ledge which jutted out from the bank some inches below the surface. His fingers found what they sought. He rose to his feet and examined his catch. + 

A small canvas bathing-sandal. From its uppers dangled a broken piece of tape. The sole was of rope. + 

“Benjamin,” said Anthony to his pipe, “I’m right. And I’ve never been so surprised in my life. It looks to me, my lad, as if A. R. Gethryn may have been wrong and Brother Boyd right. Where’s my ‘insider’ now?” + 