During a press conference, the curator of the Hôtel de Crécy is pleased to announce the presence of “The Eye of the Dragon”, an exceptional diamond, in the new exhibition of the place, entitled “The Soul and the heart. A few hours before the inauguration and opening to the public, the surveillance cameras suddenly stop. The security manager is soon found dead, his skull shattered. As for the precious stone, it has mysteriously disappeared... Raphaëlle and Astrid are then responsible for solving both the theft and the crime.