• A Secret Service: Being Strange Tales of a Nihilist
• A woman's debt
• An Eye for an Eye
• An Observer in the Near East
• As We Forgive Them
• At the Sign of the Sword: A Story of Love and War in Belgium
• Behind the bronze door
• Behind the Throne
• Beryl of the Biplane: Being the Romance of an Air-Woman of To-Day
• Britain's Deadly Peril: Are We Told the Truth?
• Devil's Dice
• German Atrocities: A Record of Shameless Deeds
• German Spies in England: An Exposure
• Guilty Bonds
• Her Majesty's Minister
• Her Royal Highness: A Romance of the Chancelleries of Europe
• Hushed Up! A Mystery of London
• If Sinners Entice Thee
• In White Raiment
• Mademoiselle of Monte Carlo
• Number 70, Berlin: A Story of Britain's Peril
• Rasputin the Rascal Monk: Disclosing the Secret Scandal of the Betrayal of Russia by the Mock-Monk Grichka and the Consequent Ruin of the Romanoffs. With official documents revealed and recorded for the first time.
• Sant of the Secret Service: Some Revelations of Spies and Spying
• Spies of the Kaiser: Plotting the Downfall of England
• Stolen Souls
• 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 Bond of Black
• The Broken Thread
• The Closed Book: Concerning the Secret of the Borgias
• The Count's Chauffeur
• The crystal claw
• The Czar's Spy: The Mystery of a Silent Love
• The Day of Temptation
• The Eye of Istar: A Romance of the Land of No Return
• The Four Faces: A Mystery
• The gamblers
• The Gay Triangle: The Romance of the First Air Adventurers
• The Golden Face: A Great 'Crook' Romance
• The Great Court Scandal
• The Great God Gold
• The Great War in England in 1897
• The Hunchback of Westminster
• The Intriguers
• The Invasion
• The Invasion of 1910, with a full account of the siege of London
• The Lady in the Car
• The Lost Million
• The Mysterious Mr. Miller
• The Mysterious Three
• The Mystery of the Green Ray
• The Pauper of Park Lane
• The Place of Dragons: A Mystery
• The Price of Power: Being Chapters from the Secret History of the Imperial Court of Russia
• The Red Room
• The Red Widow; or, The Death-Dealers of London
• The Secrets of Potsdam: A Startling Exposure of the Inner Life of the Courts of the Kaiser and Crown-Prince
• The Seven Secrets
• The Sign of Silence
• The Sign of the Stranger
• The Stolen Statesman: Being the Story of a Hushed Up Mystery
• The Stretton Street Affair
• The Temptress
• The Tickencote Treasure
• The Under-Secretary
• The Veiled Man: Being an Account of the Risks and Adventures of Sidi Ahamadou, Sheikh of the Azjar Maraude
• The Voice from the Void: The Great Wireless Mystery
• The Way to Win
• The White Lie
• The Wiles of the Wicked
• The Zeppelin Destroyer: Being Some Chapters of Secret History
• This House to Let
• Tracked by Wireless
• Whatsoever a Man Soweth
• Whither Thou Goest
• Whoso Findeth a Wife
• Zoraida: A Romance of the Harem and the Great Sahara