Of Royal Blood

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

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

Splendid

The Seven Secrets: British Murder Mystery

How to Marry a Marquis

The Count's Chauffeur: Intrigue and Deception in High Society: A Classic Spy Thriller

Brighter Than the Sun

The Collected Works of William Le Queux

Hushed Up! A Mystery of London: Intrigue and Deception in Victorian London

The Hathaways Complete Series: Mine Till Midnight, Seduce Me at Sunrise, Tempt Me at Twilight, Married by Morning, and Love in the Afternoon

The Zeppelin Destroyer: Being Some Chapters of Secret History

Mr. Cavendish, I Presume

Whoso Findeth a Wife

In White Raiment: A Victorian Tale of Intrigue and Suspense