Hidden in the Security Service's personal files, the record of a British double agent's work in the Middle East shows a man who traded German secrets for Allied victory in Sicily.
A wireless operator captured in Reykjavik was cast as a puppet in a British game of naval lies, a role that left him detained in a Surrey interrogation camp.
A retired policeman posed as a nationalist to deceive German intelligence for three years, until a Spanish intermediary was interned in 1942 to end the game.
Kept hidden in the Security Service's personal files, the transit of a fake commercial representative from Lisbon to London provided the cover for a strategic deception that saved thousands of lives.
A criminal’s double life was used to shield British factories and mislead German high command, leaving behind a record that lies about when the operation truly ended.
A Polish officer was allowed to flee to London after his Paris intelligence network was crushed, a detail buried in a file that omits the fate of those he left behind.
Nazi intelligence officers were deceived by a sprawling network of imaginary spies and curated falsehoods while MI5 case officer Thomas Harris plotted to keep the lie hidden.