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)
This Woman Wanted (1971)
The Girl in a Mask (1971) (writing as Helen K Maxwell)
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 Barclay Place (1975)
The Dark Hill (1975)
Put Out the Light (1976)
Where Helen Lies (1976)
The Slippery Step (1977)