The Minister of Evil: The Secret History of Rasputin's Betrayal of Russia

The Day of Temptation: Intrigue and Espionage in Pre-World War I Europe

The Secrets of Potsdam: A Startling Exposure of the Inner Life of the Courts of the Kaiser and Crown-Prince

The Lost Million: Espionage, Conspiracy, and Intrigue in Early 20th-Century Europe

The Stolen Statesman: Being the Story of a Hushed Up Mystery

The Red Room: Intrigue and Espionage in a Europe on the Brink of War

The Invasion

The Golden Face: A Great 'Crook' Romance

The Invasion: Espionage and Intrigue in Early 20th Century England

The Price of Power: Being Chapters from the Secret History of the Imperial Court of Russia

The White Lie: Betrayal and Deception: A Tale of Espionage and Intrigue

The Bomb-Makers: Being Some Curious Records Concerning the Craft and Cunning of Theodore Drost, an Enemy Alien in London, Together with Certain Revelations Regarding His Daughter Ella

The Intriguers: A Thrilling Tale of Deception, Betrayal, and International Espionage

The Bond of Black: An Intriguing Tale of Espionage and International Conspiracies

Number 70, Berlin: A Story of Britain's Peril

The Under-Secretary: Intrigue and Espionage in Edwardian England: A Political Thriller

The Great War in England in 1897 & The Invasion of 1910

Tracked by Wireless: Enriched edition. A Thrilling Tale of Espionage and Wireless Technology in Early 20th Century Europe

The Bomb-Makers

The Great War in England in 1897: Invasion, Espionage, and Fear: A Historical Thriller