"I expect you'd like to be near the village," Drysdale said, and suggested that the inspector should be left the lower half of the river while he went up to the hill end, where he would probably spend the day; and to that Grant gratefully agreed. As they passed opposite the manse, Grant said, "That the manse? Scotch clergymen seem to be very comfortable."

"They are," said Drysdale, with emphasis, but did not pursue the subject. Grant remarked on the apparent size of the house, and asked if they took boarders. It would be a good place to stay. Drysdale said that as far as he knew they did not take any one, and he repeated Roddy's tale of the summer letting. He took leave of Grant with the abruptness of a shy man, and departed into the landscape, leaving Grant with the comfortable knowledge that he had an ally after his own heart if the need for one should arise.

Grant decided that he would start fishing perhaps two hundred yards above the manse and work slowly down, taking his bearings and keeping an eye on the traffic to and from the house. On his side of the river there was a cart-track that was almost a road, but on the other side there was as far as he could see, only the path like a sheep-track made by the feet of fishermen and gillies, so that any one coming upriver would come on his side. The manse was surrounded by a stone wall, and faced away from him towards the high road on the other side of the river. Inside the wall was a row of scraggy firs which effectually hid the detail of the house. Only gleams of whitewash and its eight chimneys advertised its presence. At the back the garden wall ran down to the river bank, and in the middle of the wall flanking the river was a small iron gate of the strictly utilitarian pattern popular in the Highlands. Though he could not see the high road immediately in front of the house he had an uninterrupted view of the road on either side. No one could come or go from the house without his being aware of it. And he could stay where he was all day unquestioned and unremarkable. It was an ideal situation. Grant sent the first cast hissing over the brown shining water, and felt that life was good. It was too sunny for fishing and his prospects of catching anything were meagre in the extreme; but a bigger catch lay to his hand. No one had mentioned that a stranger had arrived at the manse, but just as he had known on the Brixton stair-landing that the rooms were empty, Grant now had a feeling that his man was here.

It was eleven before he began to fish, and for an hour or more no human activity other than his own broke the perfect peace of the morning. The two chimneys of the manse continued to smoke lazily into the bright air. The river babbled its eternal nursery-rhyme song at his feet, and the water slid under his eyes with a mesmeric swiftness. Away to his right beyond the distant bridge the whitewashed houses by the shore showed over the slight rise of the moor, placid and sunlit as a stage setting. Grant began to feel that the whole thing was a picture, like the illustration from which he had first learned French in his youth, and that he was merely stuck down there by the river so that the picture might be complete. He was not Grant of the C.I.D; he was pêcheur, to be pointed at with a wooden wand that tickled, for the education of some one unknown. A postman coming from the village, leaning heavily and alternately on the pedals of a push-bike, broke the spell. It was still a picture, but he no longer belonged to it. It was a stage setting — one of the tiny exhibition ones — and he was the giant who was going to upset the whole box of tricks. And, even as he thought it, the iron gate in the low wall of the manse swung open, and a girl came out, followed by a man. They shut the gate with difficulty and some laughter, and turned in single file down the footpath towards the bridge. Grant was still nearly a hundred yards above the house, and neither of them had noticed him. The man was dressed in flannel trousers, an old trench-coat, and a cap, and, except for his slightness, was as unlike the figure that had flung itself into the maelstrom of the Strand traffic as might well be. Grant was conscious of slight surprise. Revolving the matter during his long journey north, he had taken for granted that the man would look out of place. A London bookmaker's clerk would not be thrown into the western Highlands at a moment's notice and look like an habitué. Well, it might not be the man, after all. He hoped that they were making for the bridge and his side of the river, and not for the village. Surely, if they had set out for the village, they would have gone out by the front way and walked along the high road? He watched in suspense until he saw the girl turn to the bridge. But there was still a chance that they were going straight on by the high road past Carninnish House. Grant expelled a thankful breath as once more the girl turned riverwards and her companion joined her. They were coming up the river to him. They would pass only a few yards at his back. Industriously he flung a gleaming cast to the far side of the pool. He must not look their way again. In a minute or two they would have spotted him. He felt grateful to the ancient hat that collapsed more than drooped over his face, and to the shapeless garments that clothed him. His boots, too, were convincing even to the most suspicious eye. It had been no case of dressing the part this time; he was the genuine article, and he was glad of it. There would be no amateurish cast to attract the practised eye of Miss Dinmont — it must be Miss Dinmont. No suggestion of «towniness» about his clothes to call forth comment and her partner's instant interest. Suddenly above the swirl of the water he could hear their voices, raised because of the river's accompaniment. They were still laughing and animated, and apparently very good friends. Grant did not look round as they passed, nor did he look round immediately they had passed. If he glanced round now, a curious look from the man would have found his face revealed. But as they retreated upriver he watched them. Was it Lamont? He tried to picture the man's walk again. Short of developing a limp, it is almost impossible to disguise a walk successfully. But he could not be sure. And then the man looked back suddenly. Grant was too far away to see his face, but the movement told him all he wanted to know. It was so vivid that, before his reason had time to note it, his mind was back at the bottom of Bedford Street. There was no doubt of it — the man was Lamont. Grant's heart sang. Had Lamont known him? He thought not. How could he? It was mere bad conscience that had made him turn. If he asked Miss Dinmont about him, he would hear that no one who was not staying at Carninnish House was allowed to fish the water, and he would be reassured.

And now what? Go to the house when he returned and arrest him straight away? He had the warrant in his pocket. But suddenly he wanted to be assured — assured beyond the possibility of doubt — that Lamont was the man who had murdered Sorrell. They knew that he was the man who had quarrelled with Sorrell before his death. But that was not proof. The link that connected him with the knife was still missing. Before he would risk executing the warrant he wanted to find out if Lamont's left hand bore the scar made by the knife. If it did not, then his case fell to pieces. However certain he himself might be, there must be no gaps in the evidence that would be put before a jury, and as long as there was a possible gap in the evidence, Grant had no intention of arresting any one. He must get himself invited to the manse. It should not be difficult. If all else failed, he could fall into the river and appeal to them to dry him.

He was eating the sandwiches provided by the Garnie Hotel, on a boulder half in and half out of the water, when the couple came back. They went swinging past him down to the bridge and into the village, and presently he saw them reappear and come back to the manse by the high road. It was lunchtime. They were safely occupied for an hour at least, and directly under his eye.