The programme starts with the 1941 Invasion of Russia. Contributors include David Kahn
In a speech Winston Churchill publicises mass executions and the systematic slaughter of Jews, feeling the outrage greater than the imperative to protect the source.
Loris Gherardi's role in the Theft of the Black Code, and its continued use under Colonel Norman Fiske and Bonner Fellers, is reconstructed. Also, Turing’s development of the Bombe, a machine used to automate the code-breaking process.
