- Rufus Van Aldin: [Introducing himself] Mr. Poirot, Rufus Van Aldin. I'm in oil... figuratively speaking.
- Mirelle Milesi: [after being asked where she was at the time of the crime] I was in bed all night. If you seek corroboration, interrogate my pillow.
- Katherine: [watching Lady Tamplin, Lennox and Corky rushing to catch the train in Calais] What extraordinary people there are in France!
- Hercule Poirot: Oui, I don't think that we shall be bored.
- Hercule Poirot: Mademoiselle, all one ever needs are the good manners. The rest is just silliness and snobbery valued only by bores.
- Lady Tamplin: [Lenox and Corky enter] Ah, here they are at last. Katherine, my daughter Lenox. And this infant is my husband, Corky.
- Lenox Tamplin: He's not my father, obviously.
- Corky: Oh, no!
- Lenox Tamplin: That would be the astonishment of science.
- Count De La Roche: You're drunk.
- Derek Kettering: My dear count, to sit gazing at you for any length of time, drunkenness is absolutely mandatory.
- Count De La Roche: There is no shame in love. My beloved had arranged an exchange of premises in order to facilitate our assignation. She finds such things amusing.
- Derek Kettering: Yes, if I could just interrupt the proceeding for a minute? I've got something I have been meaning to give you, La Roche. Oh, yes. Here we go!
- Count De La Roche: [after being punched in the face] Animal! You could have given me a black eye!
- Derek Kettering: Matching your fingernails and your heart!
- Hercule Poirot: Gentlemen! Do you want the inspector to put you in the cells?
- Derek Kettering: You hear the way he speaks about my wife, possessing her. You had her alive. You will not have her dead!
- Count De La Roche: [shocked] In what sense dead?
- Derek Kettering: [advancing forward towards La Roche] In a sense that someone has smashed her face in with a hammer.
- Count De La Roche: I thought you were investigating a theft.
- Lady Tamplin: Now, Katherine, monsieur, there are only two rules at the Villa Marguerite. You shall be comfortable and you shall not be hungry.
- Hercule Poirot: There is something about that gentleman that displeases you.
- Rufus Van Aldin: I see no gentleman. I see Derek-god-damn-Kettering, my god-damn, gold-digging, son-of-a-bitch son-in-law.
- Corky: We are British citizens! Isn't there something in the passport that His Majesty requests and requires we aren't to be fannied about by foreign policemen?
- Hercule Poirot: No.
- Lenox Tamplin: God, I'm bored.
- Lady Tamplin: Of course, you are bored, darling. It's your hormones.
- [Corky snorts with laughter]
- Lady Tamplin: Corky, why don't you go and find a little friend to play with?
- Ruth Kettering: [handing Derek banknotes from a strongbox] Well, that's why you are here, isn't it?
- Derek Kettering: Amazingly no. I had an idea. I thought that without you father and other benign influences we might have a chance to patch things up.
- Ruth Kettering: You really are a piece of work.
- Derek Kettering: But then I discoved that the benignest influence of them all is actually in the bloody train! Have a care, Ruthie. He is not what he seems.
- Ruth Kettering: Yet another way in which he is remarkably unlike you.
- Derek Kettering: La Roche is a card shark. He is a confidence trickster.
- Ruth Kettering: I want a divorce!
- Derek Kettering: No, Ruthie... You don't.
- Ruth Kettering: I want a divorce, Derek! And you know what? That scares the hell out of you! It makes you twitch in your handmade boots because it means good bye to the Yankee milch cow, hello bankruptcy!
- Derek Kettering: I've never in my darkest hour thought of you as a cow. A horse possibly, in a betting sense.
- Ruth Kettering: So you better take what's going while you still can, hah.
- Derek Kettering: Actually, it's not enough.
- [throwing the banknotes on the floor]
- Ruth Kettering: You are insufferable!
- Derek Kettering: [grabbing her arm] I have never lied to you, Ruthie... Not once.
- Hercule Poirot: [Poirot has stepped off the Blue Train in Nice. The train whistles, then someone shrieks. Lady Tamplin stumbles out of the train] My dear Lady Tamplin! What is the matter?
- Lady Tamplin: Don't, don't. I think I'm going to be sick...
- [clutching her stomach]
- Hercule Poirot: What is the matter, Lady Tamplin?
- Lady Tamplin: Oh, God... Katherine...
- Hercule Poirot: [deeply concerned] What has happened to Mademoiselle Grey?
- Lady Tamplin: She... Oh, my God... I shouldn't have looked at all that... blood.
- [Poirot rushes into the train and collides with Lenox]
- Lenox Tamplin: [screaming in horror] Mother! Mother!
- Katherine: [Poirot hesitates at Katherine's door. Then he opens it and finds Katherine also opening the door] Oh!
- Hercule Poirot: Oh!
- Katherine: I'm so sorry I kept you waiting. I didn't find my silly comb.
- [Poirot heaves a sigh of relief]
- Hercule Poirot: [Checking the number of Katherine's compartment - No. 3] Compartment number 7!
- [He runs to investigate. Katherine looks concerned]
- Ruth Kettering: I know. The name does tend to just crash into the room and roll around like a grenade.
- Lady Tamplin: [running wearing pyjamas] Have you seen this? Corky! Corks! Where's Corks!
- Lenox Tamplin: [sunbathing] I thought you always want me to call him "daddy".
- Lady Tamplin: Whatever she says. Read that.
- [handing her a newspaper]
- Lenox Tamplin: [reading] Some woman who was poor is now rich. Whatever.
- Lady Tamplin: Katherine Grey! She's my cousin! My first cousin!
- Lenox Tamplin: Never heard of her.
- Lady Tamplin: No, ah, we never had tremendously much in common. - Why can't someone die and leave me half a million quid? I'd spend it properly and all the right tradesmen would be rewarded and fulfilled and it'd all be lovely.
- Lenox Tamplin: Darling mommy, always thinking of other people.
- Lady Tamplin: I think, I should invite Katherine to come and stay. The Riviera sunshine might cheer her up.
- Lenox Tamplin: Anyone asks me what I get from my mother and I'll say: Shamelessness.
- Lady Tamplin: Pull it out, darling, or that will be all you'll get.
- Lady at Ball: Americans are famously maladroit in their choice of wives. Look at Rufus Van Aldin, married some singer who probably drank away her figure and the little brain she possessed. She clammed on to birth a child, this one dancing, and bolted on to Buenos Aires, never heard of again. Of course, received wisdom is that Van Aldin had her bumped off.
- Lady Tamplin: Why can't someone die and leave me half a million quid? I'd spend it properly. And all the right tradesmen would be rewarded and fulfilled and it would all be lively.
- Lenox Tamplin: Darling mummy, you're always thinking of other people.
- Corky: [upon realising that Marseille was the place where the murder had been committed] Oh, hell... I have goofed.
- Hercule Poirot: No, Monsieur Corky...
- [getting into the passenger seat of the car]
- Hercule Poirot: ... you have goofed only, if the murder, it was committed by you, and this Poirot is not, at the present time,
- [closing to door]
- Hercule Poirot: disposed to believe.
- Hercule Poirot: [to Katherine Grey] Please, do excuse me, Mademoiselle... May I congratulate you for a most excellent choice of a Bourgogne. Whenever I dine here I choose this.
- [Takes the glass, looks at the opacity of the wine finding it crystal clear]
- Hercule Poirot: Oh...
- [Smells the wine, tastes it and hands it to the waiter]
- Hercule Poirot: Merci.
- [the waiter leaves]
- Hercule Poirot: Please, do forgive me, that was presumptuous in extreme.