- "The King´s Painter" (2007)
- "The Devil’s Key" (2017)
- "The Book's Secret" (2019)
Children and Youth Literature:
- The Secret of Svanetia” (2014)
- "The Secret Behind” (2012)
- "Time Trap” (2010)
- "Escape to Paradise” (2005)
- "My Friend from Space” (2001)
Kaj Bollmann was born in Copenhagen and educated as a geologist. Following the success of his books Bollmann left his scientific research and became a dedicated writer.