Along the Seine: Nicolas Flamel's ultimate secret...

Nicolas Flamel, the famous Parisian alchemist of the late 14th century, is said to have discovered the Philosopher’s Stone, which supposedly enabled him to transform lead into gold and achieve eternal life. His wealth, however, is well documented, as demonstrated by the numerous donations he made to churches and hospitals—far beyond what a simple public scribe could normally have afforded.

You are a team of treasure hunters who have recently discovered an encrypted drawing of Flamel’s tombstone, which could shed new light on the true origin of his wealth. Both the original tombstone and the drawing depict Saint Peter holding the keys to Paradise, Jesus Christ holding an orb and cross, and probably Saint Paul with his sword.

Will you be clever enough to decode the drawing’s hidden message and uncover Flamel’s well-guarded secret?

Your mission: Solve 12 enigmas to progressively decode the encrypted drawing, using clues hidden throughout Île de la Cité, around Notre-Dame, and along the banks of the Seine.