Plot: In Chicago, advertising executive and former photographer Matthew is closing a business deal in a fancy restaurant with a Chinese representative, when he sees a woman that looks like his former passion Lisa. Two years ago, Lisa and Matthew had a love affair, and Lisa simply vanished when Matthew invited her to move with him to New York, where he had the invitation for a better job, and Matthew is still obsessed with her. Matthew decides to follow Lisa, and when he meets her, he realizes that Lisa is indeed another woman with the same name. Instead of going on a business trip to China, Matthew stays in Chicago with his friend Luke and decides to investigate the mystery.
Alternative Plot: Matthew (Josh Hartnett) and Lisa (Diane Kruger) are madly in love. But one day Lisa vanishes. Simon enters an emotional tailspin and begins an obsessive quest to find her. Years later, Simon's life has stabilized, and he's in a new relationship. Then he thinks he sees Lisa in a restaurant and fixates on her all over again. He snoops around and eventually tracks down the mysterious woman from the restaurant. Her name is Alex (Rose Byrne), but she acts just like Lisa.
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