12 books • 4 series
Die Da Vinci-Maschine (Orden Der Schwarzen Sonne, #35)
The Sacret Vault of the Knights Templar
The Secrets of the Seventh Arc
The Key to Troy
Mystery of the Knights Templar Castle
The Forgotten Tomb of the Knights Templar (The Templar Legacy, #2)
The Hunt for the Book of Secrets
The Scrolls of Destiny (The Last Templars, #3)
Guardians of the Forbidden Library (The Last Templars, #2)
The Lost Treasure of the Knights Templar (The Last Templars, #1)
Project Phoenix (Order of the Black Sun, #25)
Keepers of the Lost City (Order of the Black Sun, #21)
