He had an uncommonly good forehead, a square, strong chin, a hooked nose and thin, set lips, which gave him a rather predatory air, belied rather by his pleasant blue eyes.

The sun wrinkles round their corners and his sallow complexion gave Mr.Manley the impression that he had spent some years in the tropics and suffered for it.
When Mr.Flexen had examined the room, though Inspector Perkins had already done so, he felt round the cushions of the easy chair in which Lord Loudwater had been stabbed, found nothing, and stood beside it in quiet thought.
Then he looked at Mr.Manley and said: "The murderer must have been some one with whom Lord Loudwater was so familiar that he took no notice of his or her movements, for he came up to him from the front, or walked round the chair to the front of him, and stabbed him with a quite straightforward thrust.

Lord Loudwater should have actually seen the knife--unless by any chance he was asleep." "He was sure to be asleep," said Mr.Manley quickly.

"He always did sleep in the evening--generally from the time he finished his cigar till he went to bed.

I think he acquired the habit from coming back from hunting, tired and sleepy.