“On most points he’s thoroughly sane and reliable,” said Clovis, “but at times he is subject to the most obstinate delusions, and on those occasions he becomes not merely a nuisance but a decided embarrassment.”

“What sort of delusions?”

“Unfortunately they usually centre round one of the guests of the house party, and that is where the awkwardness comes in. For instance, he took it into his head that Matilda Sheringham was the Prophet Elijah, and as all that he remembered about Elijah’s history was the episode of the ravens in the wilderness he absolutely declined to interfere with what he imagined to be Matilda’s private catering arrangements, wouldn’t allow any tea to be sent up to her in the morning, and if he was waiting at table he passed her over altogether in handing round the dishes.”

“How very unpleasant. Whatever did you do about it?”