The Dark Numbers

Harry De Wilde has obtained formulas to safely navigate the
time travel and gets his first official assignment. A professor
at a French university asks him to go back
to the year 1244, to the Cathar castle of Montségur.
According to legend, the Holy Grail was created there
last seen and the professor will do anything to
to find out what happened to that legendary treasure
happened. But the soldiers of the French king besiege
the castle, which makes the mission extremely dangerous…
This fourth installment in the popular Dark Numbers series can be purchased separately
be read. In books and films people have been searching for years
to the holy grail. The truth about the disappearance of this
mysterious object is so disturbing that no one had ever heard of it
dare to think…