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

CUCKOO'S EGG

Historical Dictionary of Ian Fleming's World of Intelligence: Fact and Fiction

Sandworm: A New Era of Cyberwar and the Hunt for the Kremlin's Most Dangerous Hackers

Historical Dictionary of International Intelligence: Edition 2

The Billion Dollar Spy: A True Story of Cold War Espionage and Betrayal

Historical Dictionary of Cold War Intelligence

Operation Mincemeat: The True Spy Story that Changed the Course of World War II

MI6: British Secret Intelligence Service Operations, 1909–1945

The Snowden Files: The Inside Story of the World's Most Wanted Man

GCHQ: The Secret Wireless War, 1900–1986

The Mitrokhin Archive: The KGB in Europe and the West

Cold War Counterfeit Spies: Tales of Espionage; Genuine or Bogus?

Good Cop, Bad War

Hitler's Trojan Horse: The Fall of the Abwehr, 1943–1945

The Illegals: Russia's Most Audacious Spies and Their Century-Long Mission to Infiltrate the West

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

The Mitrokhin Archive II: The KGB in the World

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

R.A.W. Hitman: The Real Story of Agent Lima