- _The Game of Laws_ (1989)
- _The Demon of Lies_ (1994)
- _Dragens vei_ (1996)
- _Drømmenes by_ (1998)
- _The Quest for the Grail_ (2000)
- _The Riddle of Compostela_ (2002)
- _The Testament of Mary Magdalene_ (2004)
- _The Last Secret of the Abbey_ (2006)
- _The Secret of the Templars_ (2008)
- _The Curse of the Sword_ (2010)
- _Hemmeligheten bak Paktens Ark_ (2012)
- _Profetien om pyramidene_ (2014)
- _The Code of the Maya_ (2016)
- _The Enigma of Atlantis_ (2018)
- _The Mystery of the Black Star_ (2020)
Noveller
- "The Abbey Manuscript" (1991)
- "Templarernes skatt" (1992)
- "The Legend of the Grail" (1993)
- "The Secrets of Atlantis" (1995)
- "The Prophecy of the Maya" (1997)
- "Pyramidenes gåte" (1999)
- "The Mystery of the Black Star" (2001)
- "Inkaenes skatt" (2003)
- "Hemmeligheten bak Paktens Ark" (2005)
- "The Curse of the Sword" (2007)
- "The Last Secret of the Abbey" (2009)