6 June 1944. D-Day: the biggest land and sea operation in history. What if this was only possible thanks to a nonconformist, antimilitarist mathematician whose dream was to build an artificial brain? In the small British town of Bletchley a huge game of chess was played out during WW2, the aim of which was to crack the encoded communications of the German army. And in this game the key player was Alan Turing, the inventor of what was not yet called the computer. However, after the war Turing was neither thanked nor recognized: He committed suicide in 1954 after having had to undergo a chemical castration due to his homosexuality. Mixing archive footage with shots and animation, the film traces the unlikely trajectory of this genius involved in spite of himself in world events and invites us to discover how close is the link between the Allies’ victory and the invention of the computer.