Derailed

Clive Owen and Jennifer Aniston star in Derailed as Charles Schine and Lucinda Harris, two executives who meet on a train while on their way to work, flirt a little bit with each other, and after a few encounters for lunch when they go over their lives (professional and personal) they decide to get a hotel and sleep together. They are both married and have families of their own though, but after a few maybe-we-shouldn'ts they decide to do it anyway. When they're about to do it though, Vincent Cassell's Philippe Laroche breaks into the hotel room, knocks Charles out and rapes Lucinda. They don't call the cops because they would have to say what were they doing there. Then a few days later, Philippe calls Charles and blackmails him for money or else he'll tell his wife about Lucinda.

Directed by Mikael Hafstrom and written by Stuart Beattie from a novel by James Siegel, the story is well written and keeps everything tight and well paced, and there aren't many wrong decisions taken by the characters so it works quite well. There's not much dialogue (the movie is very simple) but what is said is realistic and not goofy. It's serious movie, and the times that make for a laugh it's an actual scary laugh because of something Philippe says or does.
Clive is great here. A simple performance but very well done. Aniston is good too, though she doesn't have as much to do. Her few emotional scenes (she's the lady is distress), especially when she gets raped, are very well acted. Cassell is very good and entertaining as the classic crazy sleazy bad guy. The RZA and Xzibit are both in the movie too and they're actually pretty good. They play Charles' friend from work and Philippe's sidekick, respectively.
There's also Melissa George who plays Charles' wife Deanna. She has pretty much nothing to do and is there because Charles needs to be married in order for the story to work, and there's also a subplot about Charles and Deanna's daughter Amy who has diabetes and so they have been saving money for a long time to buy a new drug that could cure her. And that's the money Philippe wants.

The movie is good, I have to say that. There's some good suspense, pretty good acting, good R rated dialogue and the scenes when they fight (nothing big though, no action) are done very well. If I had to compare the movie with something else I'd say that is kind of like Red Eye which was also very simple and low key, but effective and suspenseful.
Oh yes, there's a twist at the end. I figured it out 5 minutes into the movie though, as there is a line one of the characters says that gives it away. In the case that you miss that line or don't get it, then you may end up really eating it all up and loving it.
Whatever happens, Derailed still works well because after the final twist there are still ten or so more minutes of movie when we get a regular and satisfactory ending.