Series | | Books |
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Cuthbert Croom | | (1905) |
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Donovan of Whitehall | | (1916) |
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Duckworth Drew | | (1903) |
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The Gay Triangle | | (1922) |
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Claud Heathwaite | | (1921) |
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Hugh Morrice | | (1911) |
| | (1911) |
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Harry Nettlefield | | (1915) |
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| | (1916) |
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Anton Prehznev | | (1892) |
| | (1892) |
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| | (1896) |
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Ray Raymond | | (1909) |
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Gerry Sant | | (1917) |
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Stella Steele | | (1916) |
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| | (1917) |
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Other | | Guilty Bonds (1891) |
| | The Temptress (1895) |
| | Devil’s Dice (1896) |
| | Whoso Findeth a Wife (1897) |
| | If Sinners Entice Thee (1898) |
| | The Bond of Black (1899) |
| | The Day of Temptation (1899) |
| | *England’s Peril (1899) |
| | An Eye for an Eye (1900) |
| | In White Raiment (1900) |
| | Of Royal Blood (1900) |
| | Wiles of the Wicked (1900) |
| | The Court of Honour (1901) |
| | The Gamblers (1901) |
| | Her Majesty’s Minister (1901) |
| | The Sign of the Seven Sins (1901) |
| | The Under-Secretary (1902) |
| | The Unnamed (1902) |
| | The Seven Secrets (1903) |
| | Three Glass Eyes (1903) |
| | The Tickencote Treasure aka The Tickencote Mystery (1903) |
| | As We...Forgive Them (1904) |
| | The Closed Book (1904) |
| | The Hunchback of Westminster (1904) |
| | The Idol of the Town (1904) |
| | The Man from Downing Street (1904) |
| | The Red Hat (1904) |
| | The Sign of the Stranger (1904) |
| | Behind the Throne (1905) |
| | Confessions of a Ladies’ Man (1905) |
| | The Czar’s Spy aka The Foreign Spy (1905) |
| | The Mask (1905) |
| | Sins of the City (1905) |
| | The Spider’s Eye (1905) |
| | The Valley of the Shadow (1905) |
| | Who Giveth This Woman? (1905) |
| | The House of the Wicked (1906) |
| | The Mysterious Mr. Miller (1906) |
| | The Mystery of a Motor-Car (1906) |
| | Whatsoever a Man Soweth (1906) |
| | The Woman at Kensington (1906) |
| | The Count’s Chauffeur (1907) |
| | The Great Court Scandal (1907) |
| | The Great Plot (1907) |
| | The Secret of the Square (1907) |
| | Whosoever Loveth: Being the Secret of a Lady’s Maid (1907) |
| | The Count's Chauffeur (1907) |
| | The Crooked Way (1908) |
| | The Lady in the Car (1908) |
| | The Looker-On (1908) |
| | The Pauper of Park Lane (1908) |
| | Stolen Sweets (1908) |
| | The Woman in the Way (1908) |
| | Fatal Thirteen (1909) |
| | The House of Whispers (1909) |
| | The Red Room (1909) |
| | The Great God Gold aka Treasure of Israel (1910) |
| | Lying Lips (1910) |
| | The Unknown Tomorrow (1910) |
| | Hushed Up! (1911) |
| | The Indiscretions of a Lady’s Maid (1911) |
| | The Money-Spider (1911) |
| | The Death-Doctor (1912) |
| | Fatal Fingers (1912) |
| | The Mystery of Nine (1912) |
| | Without Trace (1912) |
| | The Lost Million (1913) |
| | Mysteries (1913) |
| | The Price of Power (1913) |
| | The Room of Secrets (1913) |
| | A Secret Sin; or, The Madonna of the Music Halls (1913) |
| | The Four Faces (1914) |
| | The Hand of Allah aka The Riddle of the Ring (1914) |
| | Her Royal Highness (1914) |
| | The Maker of Secrets (1914) |
| | Sons of Satan (1914) |
| | The White Lie (1914) |
| | At the Sign of the Sword (1915) |
| | The Double Shadow (1915) |
| | The Mysterious Three (1915) |
| | The Mystery of the Green Ray aka The Green Ray (1915) |
| | The Sign of Silence (1915) |
| | The White Glove (1915) |
| | Annette of the Argonne (1916) |
| | The Broken Thread (1916) |
| | (1916) |
| | Inspector Whitlock, C.I.D. (1916) |
| | The Man About Town (1916) |
| | Number 70, Berlin (1916) |
| | The Place of the Dragons (1916) |
| | The Way to Win (1916) |
| | The Zeppelin Destroyer (1916) |
| | Behind the German Lines (1917) |
| | Beryl of the Biplane (1917) |
| | The Breath of Suspicion (1917) |
| | The Devil’s Carnival (1917) |
| | No Greater Love (1917) |
| | The Rainbow Mystery (1917) |
| | Rasputin the Rascal Monk (1917) |
| | Two in a Tangle (1917) |
| | Bolo the Super-Spy (1918) |
| | The Catspaw (1918) |
| | The Little Blue Goddess (1918) |
| | The Minister of Evil (1918) |
| | The Secret Life of the Ex-Tsaritza (1918) |
| | The Sister Disciple (1918) |
| | The Stolen Statesman (1918) |
| | The Yellow Ribbon (1918) |
| | Cipher Six (1919) |
| | The Doctor of Pimlico (1919) |
| | The Forbidden Word (1919) |
| | The Hotel X (1919) |
| | The King’s Incognito (1919) |
| | The Lure of Love (1919) |
| | Rasputinism in London (1919) |
| | The Secret Shame of the Kaiser (1919) |
| | Secrets of the White Tsar (1919) |
| | The Heart of a Princess (1920) |
| | The Intriguers (1920) |
| | Mysteries of a Great City (1920) |
| | No. 7, Saville Square (1920) |
| | The Red Widow; or, The Death-Dealers of London (1920) |
| | The Terror of the Air (1920) |
| | Whither Thou Goest (1920) |
| | The Elusive Four (1921) |
| | The Fifth Finger (1921) |
| | In Secret (1921) |
| | The Lady-in-Waiting (1921) |
| | Mademoiselle of Monte Carlo (1921) |
| | The Open Verdict (1921) |
| | The Power of the Borgias (1921) |
| | This House to Let (1921) |
| | The Gay Triangle (1922) |
| | The Golden Face (1922) |
| | Three Knots (1922) |
| | The Voice from the Void (1922) |
| | The Young Archduchess (1922) |
| | Behind the Bronze Door aka The Bronze Face (1923) |
| | Where the Desert Ends (1923) |
| | Bleke, the Butler (1924) |
| | The Crystal Claw (1924) |
| | Fine Feathers (1924) |
| | The Stretton Street Affair (1924) |
| | A Woman’s Debt (1924) |
| | The Blue Bungalow (1925) |
| | The Broadcast Mystery (1925) |
| | The Marked Man (1925) |
| | The Valrose Mystery (1925) |
| | The Black Owl (1926) |
| | The Dangerous Game aka Hidden Hands (1926) |
| | The Fatal Face (1926) |
| | The Letter E aka The Tattoo Mystery (1926) |
| | The Mystery of Mademoiselle (1926) |
| | The Scarlet Sign (1926) |
| | Blackmailed (1927) |
| | The Chameleon (1927) |
| | The Crimes Club (1927) |
| | The House of Evil (1927) |
| | The Lawless Hand (1927) |
| | The Office Secret (1927) |
| | Poison Shadows (1927) |
| | The Riddle of the Ring (1927) |
| | Concerning This Woman (1928) |
| | The Crime Code aka Double Nought (1928) |
| | The Peril of Helen Marklove and other stories (1928) |
| | The Rat Trap (1928) |
| | The Secret Formula (1928) |
| | The Sting (1928) |
| | Twice Tried (1928) |
| | The Amazing Count (1929) |
| | The Crinkled Crown (1929) |
| | A Crooked Affair (1930) |
| | The Golden Three (1930) |
| | The Factotum and other stories (1931) |
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