The Great War in England in 1897

The Gay Triangle: The Romance of the First Air Adventurers

Of Royal Blood: A Tale of Deception and Royal Intrigue in Edwardian England

The Czar's Spy (沙皇密諜)

Devil's Dice: Espionage, Intrigue, and Deception in Early 20th-Century Europe

Beryl of the Biplane: Being the Romance of an Air-Woman of To-Day

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

The Temptress: Espionage, Mystery, and Romance in Pre-World War I Europe

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

Mademoiselle of Monte Carlo

The Great War in England in 1897

The Eye of Istar: A Romance of the Land of No Return

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

Mademoiselle of Monte Carlo: High Society Intrigue in the French Riviera

Sant of the Secret Service: Some Revelations of Spies and Spying: Unraveling Mysteries of Spies and Intrigues: A Thrilling Spy Novel

A Secret Service: Being Strange Tales of a Nihilist: Unveiling the Dark World of Espionage and Nihilism

WAR TALES Boxed Set: Spy Thrillers, Action Classics & WWI Adventure Tales

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

The Red Widow; or, The Death-Dealers of London: Secrets and Shadows of Victorian London

Zoraida: A Romance of the Harem and the Great Sahara