Folklore still maintains that there is a treasure in Etretat which Arsène Lupin was never able to uncover. Protected by walls of mother-of-Pearl and more valuable than the jewels in the Crown of England, a parchment is supposed to have been hidden in Etretat. It held the philosopher’s stone’s secret, a secret formula coveted by all alchemists. A few handwritten notes by Fulcanneli himself mention the existence of a philosophical dwelling loaded with symbols. The location of this priceless treasure would be indicated by the sculptures which adorn the facade…