59 books • 6 series
Book #2: Das Vergessene Grab der Tempelritter
Book #5: Operation Buckingham
Book #10: The Edison Conundrum
Book #14: Invisible War
Book #15: Experiment 41
Book #16: Atomic Sun
Book #4: King Solomon's Tomb
Book #5: The Lazarus Effect
Book #16: Die Grabkammer des Herkules
Book #18: Koenig Salomons Diamanten
Book #19: Die verschollene Krone der Tempelritter
Book #44: Der Schlüssel zu Troja
Book #19: The Lost Crown of the Knights Templar
Book #20: The Inca Prophecy
Book #22: The Einstein Equation
Book #23: The Hunt for Excalibur
Book #26: The Book of Shadows
Book #4: The Knights Templar Code
Book #10: Guardians of the Abyss