Hercule Poirot: How many great stories are tragedies?

Bouc: He accuses everyone of murder.

Hercule Poirot: It's a problem, I admit.

Hercule Poirot: The romance of the desert has the power to seduce. I ask you: have you ever loved so much, been so possessed by jealousy, that you might kill?

Hercule Poirot: The crime is murder. The murderer is one of you. I have investigated many crimes, but this has altered the shape of my soul. I am detective Hercule Poirot, and I will deliver your killer.

Hercule Poirot: Flirtation, however delightful, will have no effect.

Hercule Poirot: [from the trailer] The murderer is here... and will stay here.

Rosalie Otterbourne: [to Jacqueline "Jackie" de Bellefort on murdering Bouc]

[venomously]

Rosalie Otterbourne: I Will *Watch* You *Die*

Rosalie Otterbourne: SPOILER:

[to the unknown murderer]

Rosalie Otterbourne: [venomously] I will watch you die!

Linnet Ridgeway: It's love. It's not a game played fair. There are no rules.

Hercule Poirot: [observing a couple] Ah, love. It is not safe.

Katherine: [about Hercule's disfiguring injury] It's simple. You'll grow a mustache.

Hercule Poirot: [Delivering the results of his investigation of Salome Otterbourne] She drinks to excess twice a week or more, she smokes cigarettes of various compositions, and I believe that at least 2 of her marriages were not, I think, strictly legally ended. But she is a magnificent personality.