Now that I am near completing a joint biography and critical study of Richard Wilson Webb and Hugh Callingham Wheeler, the prime movers behind the trio of pseudonyms, I am prepared to propose a list of authorship for the novels. Some of this still remains conjectural, though as much as possible I have tried to verify assumptions with primary material. So here goes! (You will notice I include the two Crimefiles books as novels; I consider them such.)
Cottage Sinister (1931) (Richard Wilson Webb and Martha Mott Kelley)
Murder at the Women's City Club (1932) (Webb and Kelley)
Murder at Cambridge (1933) (Webb)
S. S. Murder (1933) (Webb and Mary Louise White, aka Mary Louise Aswell)
The Grindle Nightmare (1935) (Webb)
Death Goes to School (1936) (Webb)
Death for Dear Clara (1937) (Webb and Hugh Callingham Wheeler)
The File on Fenton and Farr (1937) (Crimefile) (Webb and Wheeler)
The File on Claudia Cragge (1938) (Crimefile) (Webb and Wheeler)
Death and the Maiden (1939) (Webb and Wheeler)
Return to the Scene (1941) (Webb and Wheeler)
Danger Next Door (1951) (Webb)
The Dogs Do Bark (1936) (Webb and Wheeler)
Murder or Mercy? (1937) (Webb and Wheeler)
The Stars Spell Death (1939) (Webb and Wheeler)
Turn of the Table (1940) (Webb and Wheeler)
The Yellow Taxi (1942) (Webb and Wheeler)
The Scarlet Circle (1943) (Webb and Wheeler)
Death and the Dear Girls (1945) (Webb and Wheeler)
Death's Old Sweet Song (1946) (Webb and Wheeler)
The Three Fears (1949) (Wheeler)
Patrick Quentin (16 novels)
A Puzzle for Fools (1936) (Webb and Wheeler)
Puzzle for Players (1938) (Webb and Wheeler)
Puzzle for Puppets (1944) (Webb and Wheeler)
Puzzle for Wantons (1945) (Webb and Wheeler)
Puzzle for Fiends (1946) (Webb and Wheeler)
Puzzle for Pilgrims (1947) (Webb and Wheeler)
Run to Death (1948) (Webb and Wheeler)
The Follower (1950) (Wheeler)
Black Widow (1952) (Wheeler)
My Son, the Murderer (1954) (Wheeler)
The Man with Two Wives (1955) (Wheeler)
The Man in the Net (1956) (Wheeler)
Suspicious Circumstances (1957) (Wheeler)
Shadow of Guilt (1959) (Wheeler)
The Green-Eyed Monster (1960) (Wheeler)
Family Skeletons (1965) (Wheeler)
Basically, these books fall into three periods, in terms of authorship.
Murder at Cambridge was written by Webb after he lost Patsy as a writing partner (she moved to England and married) but before he gained Aswell.
After meeting Hugh Wheeler in the summer of 1933, in between the publications of Murder at Cambridge and S. S. Murder, Rickie's fate was sealed: he had met his perfect writing partner in the prodigiously talented Hugh and the two would work together for the next 15 years, until their personal relationship broke down irretrievably in the late 1940s.
As Mauro Boncompagni has indicated, Aswell did not contribute to The Grindle Nightmare, as is often stated, but it seems likely that Hugh Wheeler influenced the novel, as I have discussed in an essay in Murder in the Closet. However, at this time Rickie was still the master and Hugh, only in his mid-20s, the apprentice and Hugh did not make his official debut as novelist with the 1936 novels The Dogs Do Bark and A Puzzle for Fools, by "Jonathan Stagge" and "Patrick Quentin" respectively, and the 1937 Q. Patrick novel Death for Dear Clara. These three novels launched Rickie and Hugh's three famous series sleuths: respectively Dr. Hugh Westlake, Peter Duluth and Lt. Timothy Trant. Rickie explicitly was the creator of Duluth and Trant; perhaps Hugh, who shares initials with Hugh Westlake, created him.
This launches the second period, 1936-1948, though during this period we see Hugh become the dominant writing partner, particularly by the late 1930s and early 1940s.
Hugh himself entirely wrote the last Jonathan Stagge, The Three Fears, and the Patrick Quentins The Follower and Black Widow over 1948-51, as well as a novel with criminous elements under his own name.
A single Q. Patrick appeared, after a decade's lapse, called Danger Next Door, but this is a very short novel indeed that is based on an old novella from the Thirties, which I suspect had little, if any input from Hugh.
After Rickie left America for France in 1952, Hugh Wheeler handed off the Q. Patrick name to his old partner for future use (unfortunately Rickie didn't make too much use of it) and dropped Jonathan Stagge for good (sadly for me), but he wrote an additional seven Patrick Quentin novels, a few of them with Timothy Trant, the series sleuth who had figured in three earlier novels as well as nearly two dozen works of short fiction, which are being published for the first time in book form this summer by Crippen & Landru, an exciting event in vintage mystery fiction publishing.
I'll have more to sat about Rickie and Hugh's true crime and short fiction in a future post.