During the worst days of World War II, the British government asks the mathematician Alan Turing to unravel the mysteries of the German Enigma encryption machine, an impossible task to accomplish without the invaluable information that Hans-Thilo Schmidt, a disenchanted but greedy German citizen, had been handing over to the French secret services since 1931.
| Actor | Role |
|---|---|
 Damien BoisseauNarrator (voice) | Narrator (voice) |
 Adolf HitlerSelf (archive footage) | Self (archive footage) |
 Hermann GöringSelf (archive footage) | Self (archive footage) |
| AAlbert SarrautSelf (archive footage) | Self (archive footage) |
 Paul ReynaudSelf (archive footage) | Self (archive footage) |
 Maurice GamelinSelf (archive footage) | Self (archive footage) |
 Winston ChurchillSelf (archive footage) | Self (archive footage) |
 Joseph StalinSelf (archive footage) | Self (archive footage) |
 Bernard PivotSelf (archive footage) | Self (archive footage) |
| PPaul PailloleSelf (archive footage) | Self (archive footage) |