Four Just Men
1. The Four Just Men (1905)
2. The Council of Justice (1908)
4. The Law of the Four Just Men (1921)
     aka Again the Three Just Men
5. The Three Just Men (1929)
The Just Men of Cordova (1917)

Commissioner Sanders
Sanders of the River (1911)
The People of the River (1912)
The River of Stars (1913)
Bosambo of the River (1914)
Sandi The Kingmaker (1922)
Sanders (1926)
     aka Mr. Commissioner Sanders
Again Sanders (1928)
The Keepers of the King's Peace (1930)

J. G. Reeder
Room 13 (1924)
The Mind of Mr J G Reeder (1925)
     aka The Murder Book of J.G. Reeder
Terror Keep (1927)
The Guv'nor (1932)
     aka Mr. Reeder Returns
Mr J. G. Reeder Returns (1932)
Red Aces (1932)

Elk
The Fellowship of the Frog (1925)
The Joker (1926)
     aka The Colossus
The Twister (1928)
White Face (1931)

Educated Evans
Good Evans (1926)
     aka The Educated Man
More Educated Evans (1926)

The Mission The Failed (1898)
Unofficial Despatches (1901)
The Duke in the Suburbs (1909)
Eve's Island (1909)
The Cheaters (1910)
The Fourth Plague (1913)
The Man Who Bought London (1915)
Kate Plus 10 (1917)
The Secret House (1917)
The Clue of the Twisted Candle (1917)
The Adventures of Heine (1919)
The Green Rust (1919)
The Man Who Knew (1919)
The Daffodil Mystery (1920)
     aka The Daffodil Murder
Jack o'Judgment (1920)
The Angel of Terror (1922)
     aka The Destroying Angel
Flying Fifty-five (1922)
The Crimson Circle (1922)
The Valley of Ghosts (1922)
The Book of All Power (1923)
Captains of Souls (1923)
The Clue of the New Pin (1923)
The Missing Million (1923)
Double Dan (1924)
     aka Diana of Kara-Kara
The Face in the Night (1924)
The Sinister Man (1924)
The Three Oak Mystery (1924)
The Daughters of the Night (1925)
The Hairy Arm (1925)
     aka The Avenger
The Strange Countess (1925)
Barbara on Her Own (1926)
The Green Archer (1926)
The Man from Morocco (1926)
The Northing Tramp (1926)
     aka The Tramp
The Yellow Snake (1926)
A Debt Discharged (1926)
The Square Emerald (1926)
     aka The Girl from Scotland Yard
The Black Abbot (1926)
The Door with Seven Locks (1926)
The Man Who Was Nobody (1927)
The Mixer (1927)
Mr Justice Maxwell (1927)
Flat 2 (1927)
The Forger (1927)
     aka The Clever One
The Squeaker: London's Underworld of Crime (1927)
     aka The Squealer
The Traitor's Gate (1927)
Blue-Hand (1927)
The Brigand (1928)
The Double (1928)
The Gunner (1928)
     aka Gunman's Bluff
A King By Night (1928)
The Ringer: The Gaunt Stranger (1928)
The Terrible People (1928)
The Dark Eyes of London (1929)
For Information Received (1929)
Four Square Jane (1929)
The Ghost of Down Hill (1929)
The Golden Hades (1929)
The Green Ribbon (1929)
The Iron Grip (1929)
The Flying Squad (1929)
Planetoid 127 (1929)
The India Rubber Men: Inspector John Wade (1929)
The Queen of Sheba's Belt (1929)
The Calendar (1930)
The Clue of the Silver Key (1930)
     aka The Silver Key
Down Under Donovan (1930)
The Feathered Serpent (1930)
The Hand of Power (1930)
The Lady of Ascot (1930)
Silinski - Master Criminal: Detective T.B.Smith (1930)
The Thief in the Night (1930)
The Day of Uniting (1930)
John Flack (1930)
The Coat of Arms (1931)
     aka The Arranways Mystery
The Ringer Returns (1931)
The Devil Man (1931)
The Man at the Carlton (1931)
On the Spot: Violence and Murder in Chicago (1931)
The Frightened Lady (1932)
     aka The Mystery of the Frightened Lady
Sergeant Sir Peter (1932)
     aka Sergeant Dunn, C.I.D.
When the Gangs Came to London (1932)
Death Packs a Suitcase (1961)
King Kong (1965) (with Merian C Cooper, Delos W Lovelace)
The Road to London (1986)

The Trial of the Seddons: And Other Stories
Writ in Barracks (poems) (1900)
Heroes All: Gallant Deeds of the War (1914)
The Governor of Chi-Foo: And Other Detective Stories (1933)
Circumstantial Evidence: And Other Stories (1934)
Fighting Snub Reilly: And Other Stories (1934)
Nig-nog: And Other Humorous Stories (1934)
The Sooper: And Others (1984)
The Death Room (1986)
Classic Crime Stories (1995) (with G K Chesterton, Maurice Le Blanc, Robert Louis Stevenson)

The Standard History of the War (1914)
The War of the Nations (1914) (with William le Queux)
Kitchener's Army and the Territorial Forces: The Full Story of a Great Achievement (1915)
This England (1927)
People: Autobiography (1929)
Great Stories of Real Life (1930) (with William le Queux)