Agatha Christie,
The Adventure of the Clapham Cook
“ I am a private detective." "I know that," said our visitor. "Didn't I tell you I wanted you to find my cook for me? Walked out of the house on Wednesday, without so much as a word to me, and never came back." "I am sorry, madame, but I do not touch this particular kind of business. I wish you good morning," Our visitor snorted with indignation, "That's it, is it, my fine fellow? Too proud, eh? Only deal with Government secrets and countesses’ jewels? Let me tell you a servant's every bit as important as a tiara to a woman in my position. ”
