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