This 1932 classic has now been turned into a casual game. A snippet from the film:
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Hercule Poirot: May I be impertinent, Madame?
Frederica Rice: Is there such a thing these days?
Hercule Poirot: [he smiles] You care for Monsieur Lazarus?
Frederica Rice: He's rich.
Hercule Poirot: Oo-la-la! That is an ugly thing to say.
Frederica Rice: [smiling] Better to say it myself than have you say it.
Hercule Poirot: You're very intelligent, madame.
Frederica Rice: You'll be giving me a diploma next!
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Check out the guide if you get stuck. Best of luck!