Hercule Poirot: Has life been unfair to you mademoiselle?
Rosalie Otterbourne: You've met my mother.
Ferguson: [to Poirot] Quite a field day for you, isn't it? Everyone dropping like flies!
Ferguson: A spoiled brat, a domestic parasite, and a drunken old bat: who cares whether they're dead or not?
Cornelia Robson: You really are the rudest young man.
Ferguson: It's the future that matters, woman, not the past.
Cornelia Robson: Did you ever consider for one moment that someone out there might be grieving for that poor maid? Or how distraught Rosalie might be? And as for Linnet Doyle, well, she was just so beautiful.
Ferguson: [to Poirot, laughing] Do you know that Cornelia's father was practically ruined by Linnet's old man, and all she can say is how beautiful she was!
Cornelia Robson: I thought you said it was the future that mattered, not the past.
Ferguson: Touchee. Will you marry me?
Cornelia Robson: What?
Ferguson: It's against all my principles, I know, but I think you should, so how about it?
Cornelia Robson: It is a disgusting idea. You are opinionated, unreliable, and utterly, utterly irritating!
Ferguson: Well, apart from that?
Hercule Poirot: Love is not everything.
Jacqueline De Bellefort: Oh, but it is. It is. You must know that. Surely you understand.
Hercule Poirot: It is terrible, Mademoiselle, all that I have missed in life.
Salome Otterbourne: [pointing at Tim Allerton who kisses the hand of his mother] My god, did you see that?
Rosalie Otterbourne: Keep your voice down.
Salome Otterbourne: She is old enough to be his mother...
Rosalie Otterbourne: She is his mother!
Cornelia Robson: I'd love someone to dance with me.
Miss Van Schuyler: But who on this planet would want to dance with you?
Hercule Poirot: Do not open your heart to evil, mademoiselle. If you do there will be no turning back.
Jacqueline De Bellefort: It's so dreadfully easy, killing people, Monsieur Poirot. You begin to feel that it doesn't matter.
Jacqueline De Bellefort: She has taken everything from me, Monsieur Poirot, and I want to hurt her; to put my gun against her head, and gently pull the trigger.
Dr. Bessner: Doyle is ready to see you.
Jacqueline De Bellefort: Is he all right?
Dr. Bessner: Of course he is not all right. You shot him!
Linnet Ridgeway: God, what were they actually for?
[gesturing to a sphinx statue]
Simon Doyle: I never really thought about it. Perhaps they were their equivalent of garden gnomes.
Jacqueline De Bellefort: Nice try Simon, but just a little wide of the mark. The sphinx was, in fact, a monster from Greek mythology, with a woman's head... see? And a lionesses' body. And it said - oh, don't you want to know?
[as they walk away]
Jacqueline De Bellefort: It said riddles for travelers... and killed those who got them wrong.
Ferguson: Some lunatic's about to take power in Germany and all we read about is how some spoilt brat stole her best friend's fiance.
Rosalie Otterbourne: Some people have everything.
Joanna Southwood: Isn't it awful when one's friends fall on hard times? One simply has to drop them!