- "The Book of God: A Novel of the First Manuscript of the Bible" (2011)
- "The Second Manuscript: A Novel of the Hidden Secrets of the Vatican" (2012)
- "The Third Manuscript" (2014)
- "The Fourth Manuscript" (2015)
- "The Fifth Manuscript: The Seal" (2016)
- "The Sixth Manuscript: The Secret of the Magi" (2017)
- "The Seventh Manuscript: The Last Prophecy" (2018)
- "The Eighth Manuscript" (2019)
- "The Ninth Manuscript" (2020)
- "The Tenth Manuscript" (2021)
- "The Eleventh Manuscript" (2022)
Short stories:
- "Der letzte Mönch" (The Last Monk) (2008)
- "Die geheime Bibliothek" (The Secret Library) (2008)
- "Das verbotene Buch" (The Forbidden Book) (2009)
Non-fiction:
- "Die Suche nach dem verlorenen Wissen" (The Search for Lost Knowledge) (2010)
- "Die geheimen Archive der Vatikan" (The Secret Archives of the Vatican) (2012)
- "Die verschollenen Manuskripte" (The Lost Manuscripts) (2014)
- "Die verbotenen Bücher der Bibel" (The Forbidden Books of the Bible) (2015)
- "Die wahre Geschichte der Illuminaten" (The True History of the Illuminati) (2016)
- "Das Vermächtnis der Tempelritter" (The Legacy of the Templars) (2017)
- "Die Geschichte der geheimen Gesellschaften" (The History of Secret Societies) (2018)
- "Die Geheimnisse der Freimaurer" (The Secrets of the Freemasons) (2019)
- "Die geheime Welt der Rosenkreuzer" (The Secret World of the Rosicrucians) (2020)
- "Die Suche nach dem Heiligen Gral" (The Search for the Holy Grail) (2021)