- The Quantum Universe (1984)
- The Time Keeper (1986)
- Blind Lake (1989)
- Dark Highway (1992)
- Heaven Lake (1994)
- Disinformation (1996)
- The Hour of the Octopus (1999)
- From The Land of Ice and Snow (2001)
- Wild Blood (2004)
- Hell's Gate (2006)
- Apocrypha (2009)
- Blood Moon (2011)
- The Dark Within (2013)
- The Deep Blue (2015)
- The Blood Altar (2017)
- The Bone House (2019)
- The Devil's Den (2021)
Nonfiction:
- 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 Discoveries That Changed the World (2012)
- The Ancient Egyptian Book of the Dead (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)
- The Secret History of Freemasonry: Unveiling the Mysteries and Symbols of the World's Oldest Secret Society (2019)