An older British reporter vies with a young U.S. doctor for the affections of a beautiful Vietnamese woman.

[first lines]
Thomas Fowler: [voiceover] I can't say what made me fall in love with Vietnam - that a woman's voice can drug you; that everything is so intense. The colors, the taste, even the rain. Nothing like the filthy rain in London. They say whatever you're looking for, you will find here. They say you come to Vietnam and you understand a lot in a few minutes, but the rest has got to be lived. The smell: that's the first thing that hits you, promising everything in exchange for your soul. And the heat. Your shirt is straightaway a rag. You can hardly remember your name, or what you came to escape from. But at night, there's a breeze. The river is beautiful. You could be forgiven for thinking there was no war; that the gunshots were fireworks; that only pleasure matters. A pipe of opium, or the touch of a girl who might tell you she loves you. And then, something happens, as you knew it would. And nothing can ever be the same again.
Thomas Fowler: If I lost her, for me, it would be the beginning of death.
Hinh: [after Thomas Fowler, in Saigon, receives a letter recalling him back to London] I thought you liked London.
Thomas Fowler: I do. But I like London fine where it is, I don't want to bloody go there.
Thomas Fowler: I know I am behaving badly, but I have every intention of behaving badly. As a matter of fact, this is exactly the kind of situation where one should behave badly.
Alden Pyle: I trusted you. Thomas.
Thomas Fowler: Always a mistake with a woman involved.
Thomas Fowler: [to Pyle, who has just saved his life] If I had died, you could have had her.
Thomas Fowler: Colonel The.
Hinh: [Correcting him] General The.
Thomas Fowler: Who made him a General?
Hinh: He did.
Hinh: Sooner or later, Mr. Fowler, one has to take sides, if one is to remain human.
Thomas Fowler: Pyle est mort. Assassinated.
[last lines]
Thomas Fowler: [voiceover] They say you come to Vietnam and understand a lot in a few minutes. The rest has got to be lived. They say whatever it was you were looking for, you will find here. They say there is a ghost in every house, and if you can make peace with him, he will stay quiet.
Phuong: Pyle est mort?
Thomas Fowler: Yes,
Phuong: Pyle was in love with me.
Alden Pyle: Have you had a lot of women, Thomas?
Thomas Fowler: You start out by being promiscuous and end up like your grandfather... faithful to one woman.
Thomas Fowler: [Opening] I can't say what made me fall in love with Vietnam. That a woman's love can drug you... that everything is so intense: the colors, the taste, even the rain. Nothing like the filthy rain in London.