Excellent film

Rating: 10/10 (15 January 2017)

n 1951, two policemen, Nock and Staehl, investigate a break-in at the home of mathematician Alan Turing, whose suspicious behaviour and absence of war records causes Nock to believe that Turing may be a Soviet spy. The police send a man to follow Turing into a pub, where he hands an envelope to a male prostitute, who is arrested shortly afterward and confesses that Turing is a client. Staehl is ready to charge Turing with gross indecency, but Nock is still convinced that Turing is a spy, and begs Staehl to let him interrogate Turing for half an hour, whereupon the latter begins to disclose his top-secret activities during the war.
In 1939, after Britain declares war on Germany, Turing is accepted by Commander Alastair Denniston, of the Royal Navy, for a code-breaking job at Bletchley Park, working alongside Hugh Alexander, John Cairncross, Peter Hilton, Keith Furman, and Charles Richards. They are instructed to break the Enigma codes that the Germans use to encrypt their communications, which, as Maj Gen Stewart Menzies of MI6 explains, allows them to attack British and American shipping, leading to famine and the loss of life.