- Kvanteuniverset (1984)
- The Time Keeper (1986)
- Blind Lake (1989)
- Dark Highway (1992)
- Heaven Lake (1994)
- Desinformation (1996)
- The Hour of the Octopus (1999)
- Fra Landet med is og sne (2001)
- Wild Blood (2004)
- Hell's Gate (2006)
- Apokryfer (2009)
- Blood Moon (2011)
- The Dark Within (2013)
- The Deep Blue (2015)
- Blodalteret (2017)
- The Bone House (2019)
- The Devil's Den (2021)
Faglitteratur:
- On the Shoulders of Giants:100 Great Scientists Who Changed the World (2009)
- The Philosopher's Stone:Secrets of the Alchemists and the True Nature of Reality (2011)
- 100 opdagelser, der ændrede verden (2012)
- Den gamle egyptiske dødebog (2013)
- The Lost Books of the Bible (2014)
- The Great Pyramid:Decoding the Sacred Science of the Pharoahs (2015)
- The Templar Code:Secret History of the Knights Templar and the Holy Grail (2016)
- The Voynich Manuscript:Unlocking the Secrets of the World's Most Mysterious Text (2017)
- The Dead Sea Scrolls:Unlocking the Secrets of the Apocalyptic Library of Qumran (2018)
- Frimureriets hemmelige historie:Afsløring af mysterier og symboler for verdens ældste hemmelige samfund (2019)