Novels

• Wyvern (1988)
• Hunting the Ghost Dancer (1991)
• Kingdom of the Grail (1992)
• The Moon's Wife: A Hystery (1993)
• Solis (1994)
• Silent (1996) (with Robert S. Henderson)
• Centuries (1997)
• Hellbound (2001) (part of The Crow series of books)
• Killing with the Edge of the Moon (2006)
• The Conjure Book (2007)
• Brave Tails: The Moon's Prophecy (2009) (writing as Jonathan Sparrow)

Radix Tetrad

• Radix (1981)
• In Other Worlds (1984)
• Arc of the Dream (1986)
• The Last Legends of Earth (1989)

Arthor Series

• The Dragon and the Unicorn (1994)
• The Eagle and the Sword (1997), published in the U.K. as Arthor (1995)
• The Wolf and the Crown, published in the U.K. as The Perilous Order: Warriors of the Round Table (1998)
• The Serpent and the Grail (1999)

Dominions of Irth (writing as Adam Lee)

• The Dark Shore (1996)
• The Shadow Eater (1998)
• Octoberland (1998)

Anthologies containing his short works

• New Worlds 6 (1974)
• Nameless Places (1975)
• Epoch (1975)
• New Dimensions 7 (1977)
• New Tales of the Cthulhu Mythos (1980)
• The Year's Best Fantasy Stories 12 (1986)
• Made in Goatswood (1995)
• The Disciples of Cthulhu (1996)
• The Best of Crank! (1998)
• The Crow: Shattered Lives and Broken Dreams (1998)
• Measures of Poison (2002)
• Flights: Extreme Visions of Fantasy (2004)
• Horrors Beyond 2 (2007)

Essays

• "The Arts: Books" (1983)
• "In Responsibilities Begin Dreams" (1986)
• "Nude in the Garb Age" (1989)
• "The Crow Theory" (1998)

Novellas/Novelettes

• "The Star Pools" (1980)
• "Remains of Adam" (1994)

Short stories

• "Beowulf and the Supernatural" (1971)
• "Elder Sign" (1972)
• "Fungi" (1972)
• "Loup-Garou" (1973)
• "Once More, the Dream" (1974)
• "Interface" (1975)
• "Glimpses" (1975)
• "The Blood's Horizon" (1977)
• "The Answerer of Dreams" (1984)
• "The Last Dragon Master" (1984)
• "Matter Mutter Mother" (1984)
• "Monkey Puzzle" (1984)
• "Nuclear Tan" (1984)
• "Over the Rainbow" (1984)
• "Sherlock Holmes and Basho" (1984)
• "Atlantis Rose" (1989)
• "Ink from the New Moon" (1992) (see Great Anti-Buddhist Persecution#In Modern Fiction)
• "Maps for the Spiders" (1992)
• "Wax Me Mind" (1993)
• "The Dark One: A Mythograph" (1994)
• "A Priestess of Nodens" (1995)
• "Wolves" (1997)
• "Death's Head Moon" (2002)
• "Zero's Twin" (2004)
• "Demons Hide Their Faces" (2004)
• "Investigations of the Fractal Blood Soul" (2005)
• "Telefunken Remix" (2006)
• "Fractal Freaks" (2007)

Short Story Collections

• Beastmarks (1984)
• Twice Dead Things (2006)

• Nebula Award, Best Novel nominee, 1982 (Radix)
• World Fantasy Award, Best Novel nominee, 1992 (Hunting the Ghost Dancer)
• British Fantasy Award, Best Novel nominee, 1995 (Arthor)