Every murderer is probably somebody’s old friend,” observed Poirot philosophically. “You cannot mix up sentiment and reason. - Agatha Christie

‘You’re frightfully BBC in your language this afternoon, Albert,’ said Tuppance, with some exasperation. Albert looked slightly taken aback and reverted to a more natural form of speech. ‘I was listening to a very interesting talk on pond life last night,’ he explained.

You surprise me, Hastings. Do you not know that all celebrated detectives have brothers who would be even more celebrated than they are were it not for constitutional indolence?

In an English village, you turn over a stone and have no idea what will crawl out.
Miss Marple