Double agents operated under the nose of a dictator while British intelligence pressured Lisbon to purge Axis officers—a game of betrayal kept in the vaults of the Security Service.
British spies lived under the shadow of the Gestapo while the Lisbon government managed Axis officers across its empire, secrets now preserved in UK National Archives records.
British intelligence used double agents to deceive German intelligence in neutral Portugal, a gamble managed by the Security Service while Salazar's regime sheltered Axis officers.