Cold War Spymaster: The Legacy of Guy Liddell, Deputy Director of MI5

Double Cross in Cairo: The True Story of the Spy Who Turned the Tide of War in the Middle East

The A to Z of Sexspionage

Historical Dictionary of Sexspionage

MI6: British Secret Intelligence Service Operations, 1909–1945

Historical Dictionary of British Intelligence: Edition 2

Encyclopedia of Political Assassinations

Secret War: The Story of SOE, Britain's Wartime Sabotage Organisation

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

Historical Dictionary of Cold War Counterintelligence

Historical Dictionary of Naval Intelligence

Hitler's Nest of Vipers: The Rise Of The Abwehr

The A to Z of British Intelligence

Historical Dictionary of International Intelligence: Edition 2

GCHQ: The Secret Wireless War, 1900–1986

At Her Majestys Secret Service: The Chiefs of Britains Intelligence Service, MI6

Historical Dictionary of Cold War Intelligence

Historical Dictionary of World War I Intelligence

Hitler's Nest of Vipers: The Rise Of The Abwehr

Historical Dictionary of World War II Intelligence