- "Den grønne dør" (1946)
- "Overlad det til mig" (1948)
- "Huset på bakken" (1950)
- "Logens hemmelighed" (1952)
- "Den skjulte pool" (1954)
- "The Haunting of Hilary House" (1956)
- "The Dark Secret of Weatherend" (1958)
- "The Mystery of the Smuggler's Cove" (1960)
- "Spøgelset i spejlet" (1962)
- "The Curse of the Egyptian Mummy" (1964)
Faglitteratur:
- "Hvordan man skriver en mystisk historie" (1951)
- "Mysterieromanens kunst" (1956)
- "The Craft of Mystery Writing" (1961)
- "The Technique of Mystery Fiction" (1964)
- "Kunsten at skrive fiktion" (1968)