Agatha Christie,
The Affair at the Victory Ball
(1923)
“ You know who killed Lord Cronshaw?""Parfaitement.""Who was it? Eustace Beltane?""Ah, mon ami, you know my little weakness! Always I have a desire to keep the threads in my own hands up to the last minute. But have no fear. I will reveal all when the time comes. I want no credit—the affair shall be yours, on the condition that you permit me to play out the dénouement my own way.""That’s fair enough," said Japp. "That is, if the dénouement ever comes! But I say, you are an oyster, aren’t you?" Poirot smiled. "Well, so long. I’m off to the Yard." ”
