Unknown (2011)

Unknown is a 2011 action-thriller film directed by Jaume Collet-Serra and starring Liam Neeson, Diane Kruger, January Jones, Aidan Quinn, Bruno Ganz, and Frank Langella.^[6] The film, produced by Joel Silver, Leonard Goldberg and Andrew Rona, is based on the 2003 French novel by Didier Van Cauwelaert published in English as Out of My Head which was adapted as the film's screenplay by Oliver Butcher and Stephen Cornwell.^[7] The narrative centers around a professor who wakes up from a four-day long coma and sets out to prove his identity after no one recognizes him, including his own wife, and another man claims to be him.

Released in the United States on February 18, 2011, the film received mixed reviews from critics and grossed $136 million against its $30 million budget.

Dr. Martin Harris and his wife Liz arrive in Berlin for a biotechnology summit. At their hotel, Harris realizes he left his briefcase at the airport and takes a taxi to retrieve it. The taxi is involved in an accident and crashes into the Spree, knocking him unconscious. The driver rescues him but flees the scene. Harris regains consciousness at a hospital after being in a coma for four days.

When Harris returns to the hotel, he discovers his wife with another man. She says this man is her husband and declares she does not know Harris. The police are called, and Harris attempts to call a colleague, to no avail. He writes down his schedule for the next day from memory. When he visits the office of Prof. Leo Bressler, whom he is scheduled to meet, "Dr. Harris" is already there. As Harris attempts to prove his identity, "Harris" provides identification and a family photo, both of which have his face. Overwhelmed by the identity crisis, Harris loses consciousness and awakens back at the hospital. Smith, apparently an assassin sent to target Harris, kills Gretchen Erfurt, Harris's attending nurse, but Harris escapes.

Harris seeks help from Erfurt's friend, private investigator and former Stasi agent Ernst Jürgen. Harris's only clues are his father's book on botany and Gina, the taxi driver, a Bosnian illegal who has been working at a diner since the crash. While Harris persuades her to help him, Jürgen researches Harris and the biotechnology summit, discovering it is to be attended by Prince Shada of Saudi Arabia. The prince is funding a secret project headed by Bressler, and has survived numerous assassination attempts. Jürgen suspects that the identity theft might be related.

Harris and Gina are attacked in her apartment by Smith and another assassin, Jones; they escape after Gina kills Smith. Harris finds that Liz has written a series of numbers in his book, numbers that correspond to words found on specific pages. Using his schedule, Harris confronts Liz alone; she tells him that he left his briefcase at the airport. Meanwhile, Jürgen receives Cole at his office and reveals his findings about a secret assassination group known as Section 15. Jürgen soon deduces that Cole is a former mercenary and member of the group. Knowing Cole is there to kill him and with no way of escape, Jürgen commits suicide to protect Harris.

After retrieving his briefcase, Harris parts ways with Gina. When she sees him kidnapped by Cole and Jones, she steals a taxi and follows them. When Harris awakes, Cole explains that "Martin Harris" is just a cover name created by Harris. His head injury caused him to believe the cover persona was real; when Liz notified Cole of the injury, "Harris" was activated as his replacement. Gina runs over Jones before he can kill Harris, then rams Cole's van, killing him as well. After Harris finds a hidden compartment in his briefcase containing two Canadian passports, he remembers that he and Liz were in Berlin three months earlier to plant a bomb in Prince Shada's suite.

Now aware of his own role in the assassination plot, Martin seeks to redeem himself by thwarting it. Hotel security immediately arrests Martin and Gina, but Martin proves his earlier visit to the hotel. After security is convinced of the bomb's presence, they evacuate the hotel.

Harris realizes that Section 15's target is not Prince Shada. It is Bressler, who has developed a genetically modified breed of corn capable of surviving harsh climates. Liz accesses Bressler's laptop and steals the data. With Bressler's death and the theft of his research, billions of dollars would fall into the wrong hands. Seeing that the assassination attempt has been foiled, Liz tries and fails to disarm the bomb before it explodes. Harris kills "Harris", the last remaining Section 15 assassin, before he can murder Bressler. While Bressler announces that he is giving his project to the world for free, Harris and Gina—with new identities—board a train together.