Unknown (2011 film)

Unknown is a 2011 BritishGermanFrench psychological thriller action film directed by Jaume ColletSerra, starring Liam Neeson, Diane Kruger, January Jones, Aidan Quinn, Bruno Ganz, and Frank Langella. The film is based on the 2003 French novel published in English as Out of My Head, by Didier Van Cauwelaert.

When Martin returns to the hotel, he discovers Liz with another man, and she claims to not know him. Martin phones a colleague in the States, Prof. Rodney Cole Frank Langella but reaches only his voice mail. Martin visits the office of Prof. Leo Bressler Sebastian Koch, whom he is scheduled to meet, but sees the impostor, Martin B Aidan Quinn, already there. As Martin attempts to prove his identity, Martin B shows him his ID and family photo, both of which have the impostors face. Overwhelmed by the identity crisis, Martin falls unconscious, then finds himself back at the hospital. Smith Olivier Schneider, an assassin sent to target Martin, kills a nurse, Gretchen Erfurt Eva Lbau, but Martin escapes.Aboard a train, Martin writes down his schedule for the next day by memory. He seeks help from Erfurts friend, private investigator and former Stasi agent Ernst Jrgen Bruno Ganz. Martins only clues are his fathers book on Botany and Gina, who since the crash now works at a diner. While Martin persuades Gina to help him, Jrgen digs up information related to Martin and the biotechnology summit. He discovers the summit will be attended by Prince Shada Mido Hamada of Saudi Arabia, who is funding a secret project headed by Bressler. Prince Shada has survived numerous assassination attempts by extremists in his own country, and Jrgen suspects that Martins identity theft may be part of another attempt. ........

Source: Wikipedia