Agatha Christie,
The King of Clubs
“ Valerie, though bound to secrecy, has let me guess as much. Besides, she proves it unconsciously in a thousand ways. I believe in heredity, M. Poirot.""I too believe in heredity," said Poirot thoughtfully. "I have seen some strange things in connection with it—moi qui vous parle . . . But to business, M. le Prince. What do you want of me? What do you fear? I may speak freely, may I not? Is there anything to connect Mademoiselle Saintclair with the crime? She knew Reedburn of course?" ”
