Churchill's German Army: The Germans who fought for Britain

Mossad: The Secret History of Israel's Intelligence Agency (How the Israeli Secret Service Recruit and Train Its Officers)

Why I Became an X Troop Commando: A Life of Colin Anson, the German who Fought for Churchill

Mossad: Secrets of Israel's Elite Intelligence Agency (Assessing Seven Decades of the Mossad and Israeli National Security)

MI9: A History of the Secret Service for Escape and Evasion in World War Two

The CIA: An Imperial History

The London Cage: The Secret History of Britain's World War II Interrogation Centre

Target Tehran: How Israel Is Using Sabotage, Cyberwarfare, Assassination – and Secret Diplomacy – to Stop a Nuclear Iran and Create a New Middle East

The Walls Have Ears: The Greatest Intelligence Operation of World War II

Dead Reckoning: The Story of How Johnny Mitchell and His Fighter Pilots Took on Admiral Yamamoto and Avenged Pearl Harbor

Spymaster: The Man Who Saved MI6

Hunting Eichmann: How a Band of Survivors and a Young Spy Agency Chased Down the World’s Most Notorious Nazi

Flirting with Danger: The Mysterious Life of Marguerite Harrison, Socialite Spy

Simple Sabotage Field Manual

Lincoln’s Lady Spymaster: The Untold Story of the Abolitionist Southern Belle Who Helped Win the Civil War

The Secret War: Spies, Codes and Guerrillas 1939–1945

Area 51: An Uncensored History of America's Top Secret Military Base

Sons and Soldiers: The Jews Who Escaped the Nazis and Returned for Retribution

Watching the Jackals: Prague's Covert Liaisons with Cold War Terrorists and Revolutionaries

Intercept: The Secret History of Computers and Spies