As Lupin's mentor Don Dolune lies on his deathbed, he hands the master thief a gift, the diamond named Twilight. Though it's only half the treasure — the other half of the Twilight can be found ...

A gemstone named the Mermaid's Scale appears in a secret, underground auction, and Lupin is coerced by the queen of the underworld into stealing the rock for her. Lupin however quickly discovers ...