The Secret Tomb

An Ancient Cryptic Formula.
A Hidden Castle Treasure.
The One Mystery Arsène Lupin Left Unsolved.

When Dorothy, a spirited young rope-dancer and palmist, arrives at the historical Château de Roborey with her traveling circus of war orphans, she expects nothing more than a modest audience. Instead, she finds the castle grounds plagued by suspicious nighttime excavations and a heavy shroud of local fear. Guided by her razor-sharp intuition and the memory of a cryptic phrase uttered by her dying father—In Robore Fortuna—Dorothy quickly realizes she has stumbled onto a centuries-old puzzle that ties directly to her own forgotten lineage.

This is no ordinary treasure hunt; it is a race against a sinister, hidden enemy. The ground of Roborey conceals one of the four legendary fabulous secrets of Queen Marie-Antoinette—an immense, ancestral legacy so complex that even the great gentleman-burglar Arsène Lupin did not have the time to decipher it. Armed with her brilliant wit, absolute courage, and the help of her fiercely loyal troupe, Dorothy must decode the mathematical riddles of the past while protecting her family from a ruthless nemesis closing in on their trail.