- Hercule Poirot: The fact that Poirot discovered nothing means that there is a great deal being concealed.
- Nurse: [Referring to Ariadne who's just suffered a concussion] She's delirious!
- Ariadne Oliver: No, I'm not!
- Hercule Poirot: I assure you, this is how she is.
- Sir Roderick Horsfield: Oh, ah, why, We're having a... a little house party this weekend. Perhaps you'd like to come?
- Hercule Poirot: I would be most honored.
- Sir Roderick Horsfield: Um, d-do you have a woman in tow?
- Hercule Poirot: No.
- Sir Roderick Horsfield: Well, bring her along anyway.
- George: If you will, sir, the first time I clapped eyes on her, I thought the young lady had birds in her attic.
- Hercule Poirot: Thank you very much, George. Coffee for two, if you please.
- [last lines]
- Ariadne Oliver: You do think of things, don't you?
- Hercule Poirot: Ah.
- Ariadne Oliver: What a calculating mind!... And torturous! That's what I call it, torturous!
- Hercule Poirot: Am I so calculating, Madame? Am I a solver of puzzles with a heart that is cold? Or are we looking at the greatest of mysteries that life ever throws up? The mystery that even I, Hercule Poirot, will never be able to solve... the nature of love.