Cast the First Stone: Sam Benedict (1963) (writing as Norman Daniels)
Comedy of Terrors (1964) (with Richard Matheson)
Muscle Beach Party (1964)
The Masque of the Red Death (1964)
Dark Moon, Lost Lady (1965)
Clouds Over Vellanti (1965)
     aka Violence in Italy
Mansion of Golden Windows (1966)
The Curse of Carranca (1966)
     aka The Second Romance
The Drifting Sands (1966)
Sinister Abbey (1967)
     aka Romance on the Rhine
The Spy at the Villa Miranda (1967)
     aka Unhappy Parting
Doctor's Office (1968)
Barrow Sinister (1969)
     aka Romantic Assignment
Satan's Coast (1969)
The Governess (1969) (writing as Elsie Cromwell)
Star of Danger (1971)
Wingarden (1971)
The Diplomatic Lover (1971)
Silence Is Golden (1971)
The Passions of Medora Graeme (1972)
Prior Betrothal (1973)
Second Season (1973)
Mystery Castle (1973)
The Wicked Guardian (1973)
An Eligible Connection (1974)
The Nabob's Widow (1976)
Roommates (1976)
Fulfillment (1985)