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After a car accident in Berlin, Dr. Martin Harris (Liam Neeson) awakens to discover that his wife (January Jones) doesn't recognize him and another man (Aidan Quinn) has assumed his identity. Unable to prove who he really is, Harris finds himself the target of mysterious assassins and has to go on the run. With help from a young woman (Diane Kruger), Martin tries to uncover the truth behind what is happening to him.