The Hollow Needle

An Ancient Fortress. A Royal Enigma.
The Greatest Secret of the Kings of France.

When a daring night-time robbery at the château of Count de Gesvres leaves behind a wounded accomplice and a series of impossible clues, the Paris police find themselves completely outmatched. But the true challenger to Arsène Lupin is not a veteran inspector; it is Isidore Beautrelet, a brilliant, teenage high-school student with an analytical mind that rivals the master thief himself. As the young prodigy untangles Lupin's flawless misdirections, he uncovers a cryptic phrase that has been passed down through centuries: the secret of the Hollow Needle.

This is not a simple hunt for stolen diamonds. Beautrelet’s relentless pursuit forces Lupin to play a high-stakes, defensive game that threatens his entire empire and his carefully guarded anonymity. The trail leads directly to a massive, needle-shaped rock formation on the coast of Normandy—a legendary, hollow fortress that has hidden the immense treasures, crown jewels, and darkest secrets of the French monarchy since the days of Julius Caesar. For Lupin, this place is not just a hideout; it is his sanctuary and his ultimate pride.