Love in Amsterdam (1962)
APA: Death in Amsterdam (1964)

Because of the Cats (1963)

Question of Loyalty (1963)
APA: Gun Before Butter (1963)

Double-Barrel (1964)

Criminal Conversation (1965)

The King of the Rainy Country (1966)

Strike Out Where Not Applicable (1967)

Tsing-Boum (1969)
APA: Tsing-Boom! (1969)

The Lovely Ladies (1971)
APA: Over the High Side (1971)

Auprès de ma Blonde (1972)
APA: A Long Silence (1972)

The Widow (1979)

One Damn Thing After Another (1981)
APA: Arlette (1981)

Sand Castles (1989)

A Dressing of Diamond (1974)

What Are the Bugles Blowing For? (1975)
APA: The Bugles Blowing (1976)

Lake Isle (1976)
APA: Sabine (1978)

The Night Lords (1978)

Castang's City (1980)

Wolfnight (1982)

The Back of the North Wind (1983)

No Part in Your Death (1984)

A City Solitary (1985)

Cold Iron (1986)

Lady Macbeth (1988)

Not as Far as Velma (1989)

Those in Peril (1990)

Flanders Sky (1992)
APA: The Pretty How Town (1992)

You Know Who (1993)

The Seacoast of Bohemia (1994)

A Dwarf Kingdom (1996)

Valparaiso (1964)
[originally written as F.R.E. Nicolas]

The Dresden Green (1966)

This Is the Castle (1968)

Gadget (1977)

One More River (1998)

Some Day Tomorrow (2000)

The Janeites (2002)