- "For høj til vippen" (1992)
- "White Rat" (1993)
- "The Night Flyers" (1994)
- "Ligesom alle andre" (1995)
- "Blue Genes" (1996)
- "Damian Spinellis hemmelige liv" (1997)
- "Rubyprinsessen" (1998)
- "Diamantdronningen" (1999)
- "The Emerald Enchantress" (2000)
- "Safirgudinden" (2001)
- "The Amethyst Empress" (2002)
- "The Topaz Temptress" (2003)
- "The Granat Guardian" (2004)
- "The Onyx Oracle" (2005)
- "Perlepræstinden" (2006)
- "The Jade Jaguar" (2007)
- "The Opal Obsession" (2008)
- "The Peridot Prophecy" (2009)
- "The Aquamarine Affliction" (2010)
- "The Tanzanite Temptation" (2011)
- "The Tourmaline Torment" (2012)
- "The Citrin Curse" (2013)
- "The Malachite Misfortune" (2014)
- "The Morganite Madness" (2015)
- "The Kunzite Kaos" (2016)
- "The Iolite Illusion" (2017)
- "Aventurineventyret" (2018)
- "The Labradorite Legacy" (2019)
- "The Sunstone Secret" (2020)
- "Månestensmysteriet" (2021)
noveller:
- "The Case of the Missing Cookie Jar" (1994)
- "Sagen om den stjålne petunia" (1995)
- "The Case of the Disappearing Dog" (1996)
- "The Case of the Phantom Piano Player" (1997)
- "Sagen om det mystiske budskab" (1998)
- "The Case of the Haunted House" (1999)
- "The Case of the Secret Room" (2000)
- "The Case of the Time Traveler" (2001)
- "The Case of the Magic Spell" (2002)
- "The Case of the Super Hero" (2003)
- "The Case of the Alien Invasion" (2004)
- "The Case of the Robot Rebellion" (2005)
- "The Case of the Dinosaur Revival" (2006)
- "Sagen om den forsvundne by Atlantis" (2007)
- "The Case of the Yeti Encounter" (2008)
- "The Case of the Loch Ness Monster" (2009)
- "The Case of the Bigfoot Sighting" (2010)
- "Sagen om UFO-bortførelsen" (2011)
- "The Case of the Bermuda Triangle" (2012)
- "The Case of the Crop Circles" (2013)
- "The Case of the Stonehenge Mystery" (2014)
- "The Case of the Nazca Lines" (2015)
- "The Case of the Easter Island Statues" (2016)
- "Sagen om Den Kinesiske Mur" (2017)
- "Sagen om Chichén Itzá-pyramiden" (2018)
- "Sagen om Machu Picchu-ruinerne" (2019)
- "Sagen om Angkor Wat-templet" (2020)
- "The Case of the Petra Treasury" (2021)