The film is based on the biography, Alan Turing: The Enigma, by Andrew Hodges. Not having read the book, I can't comment on how it compares. The scriptwriter of the film, Graham Moore, did an excellent job in giving the characters life and a voice. The story is set into a specific time and place, and accurately brings alive the atmosphere of the Second World War in England. We experience the evacuation of the children from London, and the Blitz during which Nazi Germany bombed Britain nightly. The Battle of the Atlantic is also depicted, when the convoys of ships bringing food to Britain from North America were attacked by Nazi U-boats with great loss of life and ships. I found myself sorrowing over the great tragedy of war.
The film is a thriller, and the desperate need of finding the key to the code Nazi Germany's Enigma machine highly charges the film with tension. The code is vital to helping the Allies win the war. Although we know that the code will be cracked, it is fascinating to see how it was done. That Winston Churchill was so instrumental in bringing the quest to fruition, is something I didn't know.
Every member of the distinguished cast is perfect for the part they play. The director, Morten Tyldum, never strikes a wrong note. Altogether a masterpiece, this film is a classic. It is also deeply entertaining, in a totally satisfying way. John and I went to the early show on a Monday, and the cineplex was packed. Definitely a "must see"!