The Imitation Game

The Imitation Game is a 2014 American historical drama thriller film directed by Morten Tyldum, with a screenplay by Graham Moore loosely based on the biography Alan Turing The Enigma by Andrew Hodges previously adapted as the stage play and BBC drama Breaking the Code. It stars Benedict Cumberbatch as reallife British cryptanalyst Alan Turing, who decrypted German intelligence codes for the British government during World War II.

In 1951, two policemen, Nock and Staehl, investigate mathematician Alan Turing after an apparent breakin at his home. Turings suspicious behaviour and lack of war records triggers Nocks suspicion that he might be a Soviet spy. During his interrogation by Nock, Turing tells of his time working at Bletchley Park.When Britain declares war on Germany in 1939, Turing travels to Bletchley Park, where, under the direction of Commander Alastair Denniston, he joins the cryptography team of Hugh Alexander, John Cairncross, Peter Hilton, Keith Furman, and Charles Richards. The team are trying to break the ciphers created by the Enigma machine, which the Nazis use to provide security for their radio messages. ........

Source: Wikipedia