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Novels
- Alien Contact (1998)
- Ancient Evil (1985)
- Ancient Evil (1985) with J. H. Brennan
- Barmy Jeffers and the Quasimodo Walk (1988)
- Barmy Jeffers and the Quasimodo Walk (1988) with J. H. Brennan
- Barmy Jeffers and the Shrinking Potion (1989)
- Barmy Jeffers and the Shrinking Potion (1989) with J. H. Brennan
- Cancer: Black Death (1995)
- Cancer: Black Death (1995) with Maria Palmer
- Capricorn - Capricorn's Children (1995)
- Capricorn - Capricorn's Children (1995) with Maria Palmer
- Das Elfenportal [German] (2004)
- Demondoom (1985)
- Demondoom (1985) with J. H. Brennan
- Dracula's Castle (1986)
- Dracula's Castle (1986) with J. H. Brennan
- Dream of Destiny (1980)
- Dream of Destiny (1980) with Jan Brennan
- Elfenoorlog [Dutch] (2003)
- Faerie Lord (2008)
- Faerie Wars (2003)
- Fairy Nuff (2002)
- Fire Wolf (1984)
- Fire*Wolf (1984) with J. H. Brennan
- Kingdom of Horror (1985)
- Kingdom of Horror (1985) with J. H. Brennan
- L'empereur pourpre [French] (2011)
- La guerre des Elfes [French] (2011)
- La reine du Royaume [French] (2011)
- Le destin des Elfes [French] (2011)
- Marcus Mustard (1994)
- Marcus Mustard (1994) with J. H. Brennan
- Monster Horrorshow (1987)
- Monster Horrorshow (1987) with J. H. Brennan
- Nectanebo: Traveller from an Antique Land (2019)
- Nuff Said (2002)
- Ordeal by Poison (1992)
- Ordeal by Poison (1992) with J. H. Brennan
- Realm of Chaos (1986)
- Realm of Chaos (1986) with J. H. Brennan
- Return of Barmy Jeffers and the Quasimodo Walk (1988)
- Return of Barmy Jeffers and the Quasimodo Walk (1988) with J. H. Brennan
- Ruler of the Realm (2006)
- Shiva (1989)
- Shiva (1989) with J. H. Brennan
- Shiva Accused (1991) with J. H. Brennan
- Shiva's Challenge (1992)
- Shiva's Challenge (1992) with J. H. Brennan
- The Castle of Darkness (1984)
- The Castle of Darkness (1984) with J. H. Brennan
- The Crone (1990)
- The Crone (1990) with J. H. Brennan
- The Crypts of Terror (1984)
- The Crypts of Terror (1984) with J. H. Brennan
- The Curse of Frankenstein (1986)
- The Curse of Frankenstein (1986) with J. H. Brennan
- The Den Of Dragons (1984)
- The Den Of Dragons (1984) with J. H. Brennan
- The Doomsday Box (2010)
- The Faeman Quest (2011)
- The Gateway of Doom (1984)
- The Gateway of Doom (1984) with J. H. Brennan
- The Gravediggers (1996)
- The Gravediggers (1996) with J. H. Brennan
- The Greythorn Woman (1979)
- The Greythorn Woman (1979) with Jan Brennan
- The Purple Emperor (2004)
- The Secret Prophecy (2012)
- The Shadow Project (2009)
- Voyage of Terror (1985)
- Voyage of Terror (1985) with J. H. Brennan
- Ghosts on Tape: True Ghost Stories (1993)
- Ghosts on Tape: True Ghost Stories (1993) with J. H. Brennan
- Seriously Weird True Stories (1997)
- Seriously Weird True Stories 2 (1998)
- La guerre des Elfes [French] (2012) [O/1-4]
- Achilles Heel (1978)
- The Mystery Machine (1995)
- The Codebreaker's Handbook (2006)
- The Young Ghosthunter's Guide (1990) with J. H. Brennan
- The Young Ghosthunters' Guide (1990)
- Through the Wardrobe: Your Favorite Authors on C.S. Lewis' Chronicles of Narnia (2008) with Leah Wilson
- A Paper Twist of Khorlo Crystals (1973)
- Achilles Heel (1978)
- Akilleshälen [Swedish] (1981)
- Angel (1976)
- Big City (1973)
- Blessing in Disguise (1976)
- Death of God (1973)
- Die letzte Instanz [German] (1967) with J. H. Brennan
- Final Appeal (1965)
- Final Appeal (1965) with J. H. Brennan
- Fourth Reich (1974)
- Il ciclo di Saros [Italian] (1977)
- Il dilemma di Benedetto XVI [Italian] (1978)
- La décision d'Armaguedon [French] (1978)
- La guerre des Elfes: Livre V (excerpt) [French] (2012)
- La machine volante [French] (1977)
- Le seigneur du temps [French] (1978)
- Mammoth (1974)
- Mammut [German] (1974)
- Saros (1976)
- Saros [German] (1977)
- Stadt der Riesen [German] (1975)
- Such As Dreams Are Made Of (2006)
- Taming of the Shrew (1979)
- The Aerial Machine (1974)
- The Armageddon Decision (1977)
- The Gods' Decision (1974)
- The Mystery Machine (1995)
- The Necromancers (2007)
- The Purple Emperor (excerpt) (2007)
- The Yidam (1975)
- Time Lord (1978)
- Zaros [French] (1979)
- The Synchronistic Barometer (1973)