House of Treason (1936) (writing as Dennis Allan)
Brandon Is Missing (1940) (writing as Dennis Allan)
Born to Be Murdered (1945) (writing as Dennis Allan)
Dead to Rights (1946) (writing as Dennis Allan)
The Girl in a Mask (1971) (writing as Helen K Maxwell)
This Woman Wanted (1971)
The first Mrs. Winston (1972)
Leave It to Amanda (1972) (writing as Helen K Maxwell)
Sleep Without Morning (1972)
The Livingston Heirs (1973) (writing as Helen K Maxwell)
One O'clock At the Gotham (1974)
The Dark Hill (1975)
The Barclay Place (1975)
Put Out the Light (1976)
Where Helen Lies (1976)
The Slippery Step (1977)