- Hastings: But surely no one could think of murder in such a beautiful place.
- Hercule Poirot: No, no, no, no, Hastings. It is romantic, yes. It is peaceful. The sun shines, the sea it is blue. But you forget, mon ami, that there is evil everywhere under the sun.
- Hercule Poirot: [upon hearing a doctor's diagnosis of his fainting at a social gathering] I demand at once a second opinion! Hercule Poirot, he is not obese!
- Miss Lemon: 'Medically obese,' Mr. Poirot; it's not quite the same thing.
- [Emily Brewster reveals that there was a hint of paleness under the tan on Arlena's body]
- Chief Inspector Japp: The paleness of death.
- Hastings: This must be that ladder down to Pixie Cove.
- Hercule Poirot: Comment?
- Hastings: Pixie Cove. It's what they call this beach.
- Hercule Poirot: For me, Hastings, I call it too steep and too dangerous.
- Hercule Poirot: [while talking about the possible reasons for Arlena Stuart entering the cave] But then the question becomes why did Arlena Stuart enter the cave?
- Hastings: Perhaps she was hiding from someone.
- Hercule Poirot: Hastings... Once again you come up with an explanation that makes everything clear.
- Chief Inspector Japp: Not to me it doesn't.
- Hastings: You mean she was afraid of someone?
- Hercule Poirot: I mean, Hastings, that there is evil on this island. And the murder that took place here was the work of a mind that was brilliant. But there is one thing the killer did not expect, eh - the mind of Hercule Poirot. En bien. It is now time for these two minds to meet, and the truth at last must come to light.
- Miss Lemon: [Poirot is on his way to Hastings' El Ranchero restaurant] You look very smart Mr Poirot.
- Hercule Poirot: You think so Miss Lemon? It is true.
- Hercule Poirot: [as a waitress sets down his plate of roast beef and vegetables] Voila, Hastings! The little gray cells, they are the army of Napoleon.
- Hastings: You mean they march on their stomach.
- Hastings: It's good to see you back on form, Poirot.
- Chief Inspector Japp: Mm, hmm. One helping of spotted dick and you'll probably solve it.
- Hastings: [reading get-well cards to Poirot] From everyone at the Forensics Department, Scotland Yard.
- Chief Inspector Japp: Broken bottles, running baths - trouble with you, Poirot, is you always have to make everything so complicated.