- (1939) Novel: "The Carlent Murder Crime"
- (1964) Novel (as Leo Grex)): "The Brass Knuckles"
- (1947) Novel: "The Atlantic Murder"
- (1939) Novel (as Leo Grex): "The Arsenal Stadium Mystery" (filmed as The Arsenal Stadium Mystery (1939))
- (1952) Novel: "The Ace of Danger" (as Leo Grex)
- (1940) Novel (as Leo Grex): "The Crooked Sixpence"
- (1961) Novel: "Clues That Spelled Guilty"
- (1929) Novel: "The Case of the Marsden Rubies"
- (1937) Novel: "The Case-Book of Anthony Slade"
- (1936) Novel: "The Case of the Malverne Diamonds"
- (1951) Novel: "The Frightened Chameleon".
- (1959) Novel: "Don't Argue with Death".
- (1956) Novel: "Death Pays the Piper".
- (1934) Novel: "Death Chime".
- (1935) Novel (as Leo Grex)): "Crooner's Swan Song".
- (1929) Novel: "The Gillespie Suicide Mystery" (aka "The Terrace Suicide Mystery").
- (1952) Novel: "The Glass Alibi".
- (1930) Novel: "The Grand Modena Murder".
- (1950) Novel (as Leo Grex): "Hangman's Moon".
- (1964) Novel: "Heads, You Die".
- (1954) Novel (as Leo Grex): "The Inverted Crime".
- (1933) Novel: "Is This Revenge?"
- (1948) Novel (as Leo Grex): "King Spiv".
- (1959) Novel (as Leo Grex): "Larceny in Her Heart".
- (1933) Novel (as Leo Grex): "The Lonely Inn Mystery".
- (1933) Novel (as Leo Grex): "Madison Murder".
- (1935) Novel (as Leo Grex): "The Man from Manhattan".
- (1953) Novel (w/Janet Green): "Murder Mistaken".
- (1936) Novel (as Leo Grex): "Murder in the Sanctuary".
- (1952) Novel (as Leo Grex): "Murder Out of Season".
- (1935) Novel: "Mystery at Tudor Arches".
- (1951) Novel: "Mystery Manor".
- (1931) Novel (as Leo Grex): "The Neighbors".
- (1931) Novel: "Nightborn".
- (1948) Novel (as Dexter Muir): "Pilgrims Meet Murder".
- (1934) Novel: "The Riddle of the Ravens".
- (19836) Novel: "Riley of the Special Branch".
- (1952) Novel (as Dexter Muir): "Rosemary for Death".
- (1954) Novel (w/Geraldine Laws): "Sally of Scotland Yard".
- (1933) Novel: "The Secret of Tangles".
- (1948) Novel: "The Secret of the Red Mill".
- (1932) Novel: "The Serpentine Murder".
- (1953) Novel (as Leo Grex): "She Died Laughing".
- (1934) Novel (as Leo Grex): "The Signet of Death".
- (1949) Novel (as Dexter Muir): "The Speckled Swan".
- (1947) Novel (as Leo Grex): "Stalag-Mites".
- (1958) Novel: "Stand-In for Murder".
- (1936) Novel (as Leo Grex): "Stolen Death".
- (1932) Novel: "The Stolen Home Secretary" (aka "The Stolen Statesman").
- (1957) Novel: "Superintendent Slade Investigates".
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