| Series | | Books |
| Jack Carew |
| |
| Other | | The Secret of the Stargazers' Club (see The Mystery Man) (1926) |
| | | The Leather Glove (1927) |
| |
| H. Haverstock Hill |
| |
| Other | | Anne of the Flying Gap (1926) |
| | | Spoil of the Desert (1927) |
| | | The Golden Isle (1928) |
| | | Golden Harvest (1929) |
| |
| Stephen Maddock |
| |
| Timothy Terrel | | (1933) |
| | | (1934) |
| | | (1934) |
| | | (1934) |
| | | (1935) |
| | | (1935) |
| | | (1936) |
| | | (1936) |
| | | (1937) |
| | | (1938) |
| | | (1938) |
| | | (1939) |
| | | (1940) |
| | | (1941) |
| | | (1943) |
| | | (1944) |
| | | (1945) |
| | | (1946) |
| |
| Other | | Step Aside to Death (1942) |
| | | Exit Only [Insp. Slane] (1947) |
| | | East of Piccadilly [Insp. Slane] (1948) |
| | | Keep Your Fingers Crossed [Insp. Slane] (1949) |
| | | Private Line [Insp. Slane] (1950) |
| | | Public Mischief (1951) |
| | | Close Shave (1952) |
| |
| J. M. Walsh |
| |
| Oliver Keene | | (1937) |
| | | (1938) |
| | | (1939) |
| | | (1939) |
| | | (1940) |
| | | (1940) |
| | | (1941) |
| | | (1941) |
| | | (1942) |
| | | (1943) |
| | | (1944) |
| | | (1945) |
| |
| Colonel Ormiston | | (1928) |
| | | (1933) |
| | | (1933) |
| | | (1933) |
| | | (1934) |
| | | (1934) |
| | | (1935) |
| | | (1935) |
| | | (1935) |
| | | (1936) |
| | | (1936) |
| | | (1937) |
| |
| Other | | Tap-Tap Island (1921) |
| | | The Lost Valley (1921) |
| | | The White Mask [Bromley Kay] (1925) |
| | | The Brethren of the Compass (1925) |
| | | The Company of Shadows (1926) |
| | | The Hairpin Mystery (1926) |
| | | The Man Behind the Curtain [Bromley Kay] (1927) |
| | | The League of Missing Men [Bromley Kay] (1927) |
| | | The Images of Han (1927) |
| | | The Hand of Doom [Insp. Quaile] (1927) |
| | | The Crimes of Cleopatra’s Needle (1928) |
| | | The Purple Stain (1928) |
| | | The Silver Greyhound [Insp. Storm] (1928) |
| | | The Black Cross (1928) |
| | | The Mystery of the Green Caterpillars (1929) |
| | | The Mystery of the Crystal Skull (1929) |
| | | The Tempania Mystery (1929) |
| | | The Week-End Crime Book (1929) |
| | | The Mystery Man (1929) |
| | | Exit Simeon Hex [Bromley Kay] (1930) |
| | | The Black Ghost (1930) |
| | | The Whisperer [Insp. Storm] (1931) |
| | | Mystery House (1931) |
| | | A Girl of the Islands (1932) |
| | | The Bandits of the Night (1932) |
| | | Lady Incognito [Insp. Quaile] (1932) |
| | | Freelance Spy (1937) |
| | | Chalk-Face (1937) |
| | | Mutton Dressed As Lamb, and Live Bait (1944) |
| | | The Man Who Grew Bulbs (1945) |
| | | Express Delivery [Mike Harman] (1946) |
| | | Once in Tiger Bay (1947) |
| | | Walking Shadow [Mike Harman] (1948) |
| | | Time to Kill [Mike Harman] (1949) |
| | | Return to Tiger Bay (1950) |
| | | Next, Please (1951) |
| | | King of Tiger Bay (1952) |
| |
| George M. White |
| |
| Other | | From Boniface to Bank Burglar aka The Price of Persecution (1925) |
| | | The Mystery of the Crystal Ball (1926) |
| |