MI5: British Security Service Operations, 1909 1945: The True Story of the Most Secret counter-espionage Organisation in the World

Inside The Enigma: British Officials In Russia, 1900-39

The Stasi: The East German Intelligence and Security Service: Ea

Ring of Spies: How MI5 and the FBI brought down the Nazis in America HB

Thatcher's Spy: My Life as an MI5 Agent Inside Sinn Féin