- *Mørk vinter* (1989)
- *Red Rain* (1990)
- *Sort sne* (1991)
- *Den sidste drage (1992)
- *Slangeprinsen (1994)
- *Isprinsessen (1995)
- *Profetien (1996)
- *Amuletten (1997)
- *Balken (1998)
- *Sværdet (1999)
Faglitteratur
- *En guide til rollespil* (1981)
- *The World of Dungeons &Dragons* (1984)
- *The Complete Book of Elves* (1986)
- *The Complete Book of Dwarves* (1988)
- *The Complete Book of Orcs* (1990)
- *The History of Middle-earth* (1992)
- *The Art of Middle-earth* (1995)
- *The Maps of Middle-earth* (1997)
- *The Tolkien Companion* (1999)
- *J.R.R. Tolkien:A Biography* (2000)