Derailed (2005)

What an absolutely hateful film -- a nasty story and a cheat with too many twists.  Happily-married Clive Owen meets happily-married Jennifer Aniston on a train when he has no money for the fare.  Their friendship blossoms and they reluctantly begin a physical affair in a seedy hotel; however before the relationship is consummated, violent crim Vincent Cassel bursts into the room, badly beating Owen and violently raping Aniston.  She dissuades him from reporting the incident to the police on the grounds that it would break up her marriage and cause her to lose her daughter, so Owen becomes the target for Cassel's increasingly large blackmail demands and his physical cruelty and threats.  Fearing for his wife and child (for whom the couple have been saving money for an expensive medical procedure), Owen caves in.  That is the gist of the tale, but far from the whole story which continues to get nastier and more outlandish.  Apart from the fact that Cassel makes a believable sadist (we have seen this before), I just couldn't buy the so-called chemistry between the other two leads.  Owen is an able actor, but not one that I look forward to watching and Aniston is limited in moving past her comedy roots, so all in all viewing this movie was a dispiriting experience.