The film follows Charles Schine (played by Clive Owen), a married man who commutes by train to work every day. One day, he meets Lucinda Harris (played by Jennifer Aniston) on the train, and they strike up a flirtatious conversation. Despite both being married, they are drawn to each other and eventually begin an affair.
Their secret trysts are discovered by a mysterious stranger named LaRoche (played by Vincent Cassel), who blackmails Charles and Lucinda. LaRoche threatens to reveal their affair to their spouses unless they pay him a large sum of money. Fearing the consequences of exposure, Charles agrees to pay LaRoche.
However, things take a dark turn when LaRoche brutally attacks Charles and rapes Lucinda. Traumatized by the ordeal, Charles becomes determined to seek revenge and bring LaRoche to justice. With the help of a friend, Charles sets out to track down LaRoche and confront him once and for all.
In the climax of the film, Charles confronts LaRoche in a tense showdown, leading to a violent altercation between the two men. In a twist of fate, it is revealed that Lucinda has been in on the scheme all along, and she and LaRoche were working together to extort money from Charles.
Feeling betrayed and heartbroken, Charles realizes that he has been manipulated and deceived by Lucinda and LaRoche. He fights back against his tormentors and manages to overpower LaRoche, ultimately killing him in self-defense.
The film ends with Charles returning home to his wife, shell-shocked by the events that have transpired. Despite the trauma and betrayal he has experienced, Charles is determined to move forward with his life and rebuild his marriage.
Overall, “Derailed” is a gripping and suspenseful thriller that explores themes of betrayal, revenge, and moral ambiguity. With its twists and turns, the film keeps viewers on the edge of their seats until the very end, leaving them questioning the nature of trust and the consequences of infidelity.