With the war at its height in March of 1943, the cryptanalysts at Bletchley Park, England, have a problem — the Nazi U-boats have improved the security of their Enigma machine ciphers, leading to a blackout in naval signals intelligence; this could spell disaster in the critical Battle of the Atlantic, on whose outcome Britain's survival depends. The British cryptanalysts have cracked the cipher before, and they need to do it again. Fortunately, British authorities have enlisted a brilliant young mathematician named Tom Jericho to help with the effort. The film is based on a novel by Robert Harris.

Released: 2001