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.

[7] 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.

[8] 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.

Harris's only clues are his father's book on botany and Gina, the taxi driver, an undocumented Bosnian immigrant who has been working at a diner since the crash.

The prince is funding a secret project headed by Bressler, and has survived numerous assassination attempts.

Meanwhile, Jürgen receives Cole at his office and reveals his findings of a secret terrorist group known as Section 15.

Knowing Cole is there to interrogate and kill him and with no way of escape, Jürgen commits suicide to protect Harris.

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.

Harris realizes that Section 15's target is not Prince Shada, but Bressler, who has developed a genetically modified breed of corn capable of surviving harsh climates.

Seeing that the assassination attempt has been foiled, Liz tries to disarm the bomb but fails and is killed when it explodes.

[10] Producer Joel Silver's US company Dark Castle Entertainment contributed $30 million.

The website's consensus reads: "Liam Neeson elevates the proceedings considerably, but Unknown is ultimately too derivative – and implausible – to take advantage of its intriguing premise.

[16] Richard Roeper gave the film a B+ and wrote, "At times, Unknown stretches plausibility to the near breaking point, but it's so well paced and the performances are so strong and most of the questions are ultimately answered.