" Poirot looked up at the sky. ‘When the sun shines you cannot see the moon,’ he said. ‘But when the sun is gone–ah, when the sun is gone.’ Cornelia’s mouth fell open. ‘I beg your pardon?’ ‘I was saying, Mademoiselle, that when the sun has gone down, we shall see the moon. That is so, is it not? "

― Agatha Christie