David Trevisan series (contemporary occult suspense)
Magicians (published as The Fair Rules of Evil; Avon Books, 1989)
The Eyes of Night (Avon Books, 1991)
Synopsis of a Third David Trevisan Novel (self-published limited edition, 1993)
The Fall of the First World (epic fantasy)
The Fall of the First World, Book I: The West Is Dying (published as The Master of Evil; Pinnacle Books, 1983)
The Fall of the First World, Book II: Sorrowing Vengeance (Pinnacle Books, 1983)
The Fall of the First World, Book III: The Passing of the Gods (Pinnacle Books, 1983)
Red Sonja series (adventure-fantasy)
Red Sonja #1: The Ring of Ikribu (with Richard L. Tierney; Ace Books, 1981; Heyne Bucher, West Germany, 1985)
Red Sonja #2: Demon Night (with Richard L. Tierney; Ace Books, 1982; Heyne Bucher, West Germany, 1985)
Red Sonja #3: When Hell Laughs (with Richard L. Tierney; Ace Books, 1982; Heyne Bucher, West Germany, 1985)
Red Sonja #4: Endithor’s Daughter (with Richard L. Tierney; Ace Books, 1982; Heyne Bucher, West Germany, 1985)
Red Sonja #5: Against the Prince of Hell (with Richard L. Tierney; Ace Books, 1983; Heyne Bucher, West Germany, 1985)
Red Sonja #6: Star of Doom (with Richard L. Tierney; Ace Books, 1983; Heyne Bucher, West Germany, 1985)
Oron series (adventure-fantasy)
Oron (Zebra Books, 1978; Forma, Czech Republic, 1996, in two volumes: Válečník a Býčí Muž and Král a Býčí Muž)
The Shadow of Sorcery (published as The Sorcerer’s Shadow; Zebra Books, 1978)
Reign, Sorcery! (published as Mosutha’s Magic; Zebra Books, 1982)
Deathwolf (published as The Valley of Ogrum; Zebra Books, 1983)
Death in Asakad and Other Stories (published as The Ghost Army; Zebra Books, 1983)
Other
Seasons of the Moon (self-published, 2005)
For the Witch of the Mists (historical fantasy; with Richard L. Tierney; Zebra Books, 1978; Ace Books, 1981; Bastei Lubbe, West Germany, 1985)
The Witch of the Indies (historical fantasy; Zebra Books, 1977)