The two girls drifted swiftly along. In front of them, at the corner of the lake, near the road, was a mossy boat–house under a walnut tree, and a little landing–stage where a boat was moored, wavering like a shadow on the still grey water, below the green, decayed poles. All was shadowy with coming summer.

Suddenly, from the boat–house, a white figure ran out, frightening in its swift sharp transit, across the old landing–stage. It launched in a white arc through the air, there was a bursting of the water, and among the smooth ripples a swimmer was making out to space, in a centre of faintly heaving motion. The whole otherworld, wet and remote, he had to himself. He could move into the pure translucency of the grey, uncreated water.

Gudrun stood by the stone wall, watching.

‘How I envy him,’ she said, in low, desirous tones.

‘Ugh!’ shivered Ursula. ‘So cold!’

‘Yes, but how good, how really fine, to swim out there!’ The sisters stood watching the swimmer move further into the grey, moist, full space of the water, pulsing with his own small, invading motion, and arched over with mist and dim woods.

‘Don’t you wish it were you?’ asked Gudrun, looking at Ursula.

‘I do,’ said Ursula. ‘But I’m I not sure—it’s so wet.’

‘No,’ said Gudrun, reluctantly. She stood watching the motion on the bosom of the water, as if fascinated. He, having swum a certain distance, turned round and was swimming on his back, looking along the water at the two girls by the wall. In the faint wash of motion, they could see his ruddy face, and could feel him watching them.

‘It is Gerald Crich,’ said Ursula.

‘I know,’ replied Gudrun.

And she stood motionless gazing over the water at the face which washed up and down on the flood, as he swam steadily. From his separate element he saw them and he exulted to himself because of his own advantage, his possession of a world to himself. He was immune and perfect. He loved his own vigorous, thrusting motion, and the violent impulse of the very cold water against his limbs, buoying him up. He could see the girls watching him a way off, outside, and that pleased him. He lifted his arm from the water, in a sign to them.

‘He is waving,’ said Ursula.

‘Yes,’ replied Gudrun. They watched him. He waved again, with a strange movement of recognition across the difference.

‘Like a Nibelung,’ laughed Ursula. Gudrun said nothing, only stood still looking over the water.

Gerald suddenly turned, and was swimming away swiftly, with a side stroke. He was alone now, alone and immune in the middle of the waters, which he had all to himself. He exulted in his isolation in the new element, unquestioned and unconditioned. He was happy, thrusting with his legs and all his body, without bond or connection anywhere, just himself in the watery world.

Gudrun envied him almost painfully. Even this momentary possession of pure isolation and fluidity seemed to her so terribly desirable that she felt herself as if damned, out there on the high–road.

“You will have your data soon,” I remarked, pointing with my finger; “this is the Brixton Road, and that is the house, if I am not very much mistaken.”

“So it is. Stop, driver, stop!” We were still a hundred yards or so from it, but he insisted upon our alighting, and we finished our journey upon foot.

Number 3, Lauriston Gardens wore an ill-omened and minatory look. It was one of four which stood back some little way from the street, two being occupied and two empty. The latter looked out with three tiers of vacant melancholy windows, which were blank and dreary, save that here and there a “To Let” card had developed like a cataract upon the bleared panes. A small garden sprinkled over with a scattered eruption of sickly plants separated each of these houses from the street, and was traversed by a narrow pathway, yellowish in colour, and consisting apparently of a mixture of clay and of gravel. The whole place was very sloppy from the rain which had fallen through the night. The garden was bounded by a three-foot brick wall with a fringe of wood rails upon the top, and against this wall was leaning a stalwart police constable, surrounded by a small knot of loafers, who craned their necks and strained their eyes in the vain hope of catching some glimpse of the proceedings within.

I had imagined that Sherlock Holmes would at once have hurried into the house and plunged into a study of the mystery. Nothing appeared to be further from his intention. With an air of nonchalance which, under the circumstances, seemed to me to border upon affectation, he lounged up and down the pavement, and gazed vacantly at the ground, the sky, the opposite houses and the line of railings. Having finished his scrutiny, he proceeded slowly down the path, or rather down the fringe of grass which flanked the path, keeping his eyes riveted upon the ground. Twice he stopped, and once I saw him smile, and heard him utter an exclamation of satisfaction. There were many marks of footsteps upon the wet clayey soil; but since the police had been coming and going over it, I was unable to see how my companion could hope to learn anything from it. Still I had had such extraordinary evidence of the quickness of his perceptive faculties, that I had no doubt that he could see a great deal which was hidden from me.

At the door of the house we were met by a tall, white-faced, flaxen-haired man, with a notebook in his hand, who rushed forward and wrung my companion’s hand with effusion. “It is indeed kind of you to come,” he said, “I have had everything left untouched.”

“Except that!” my friend answered, pointing at the pathway. “If a herd of buffaloes had passed along, there could not be a greater mess. No doubt, however, you had drawn your own conclusions, Gregson, before you permitted this.”

“I have had so much to do inside the house,” the detective said evasively. “My colleague, Mr. Lestrade, is here. I had relied upon him to look after this.”