It is 1883. The unthinkable has happened. The Chopard necklace is gone. There is a lot of confusion in the detective office. Who could enter one of the most heavily guarded museums in the country?

After several months of investigation, it seems you were finally getting closer to uncovering the identity of the thieves. But shortly afterward, your colleague leading the case is kidnapped. In his ransacked apartment, you find his hidden briefcase. He must have been close to discovering the thieves' identities, thus he was taken. The question is, can you solve the case by uncovering the secrets of the mysterious briefcase?