The film is about the life and work of Alan Turing, the mathematician, who helped break the German codes in World War ll and pioneered the development of computer technology.
It told the story of Alan's friendship with a little boy who was in his class in school. The boy, who had TB, died while on holidays and Alan was brokenhearted. The two of them were by far the best in the class at sums. Alan believed that the mind of his school friend lived on.
He named his code breaker/computer at Bletchley Park after his little friend, Christopher.
And then after the war, the story of his homosexuality and how he was treated in such a cruel fashion.