Lupin walks into a trap that's actually three traps stacked inside each other, and he knows it the whole time. The ring is never the score, it's the map to the real score, which is never the real score either, and by the time you realize the brooch might actually be a weapon, you've already lost track of who's hunting whom. This is Lupin at his most purely functional: every scene is a setup, every setup is a con, every con is setting up the next con, and the joke is that everyone involved, including you, sees it coming and walks straight into it anyway.
Lupin orchestrates a daring heist at a New York auction house, snatching a seemingly ordinary ring. What he doesn't know is that the seemingly routine score has just painted a target on his back. Zenigata arrives ready to make an arrest, but he's not the only hunter on Lupin's trail. A brutish ex-KGB operative named Nabikov shadows every move, working for Cynthia, the ruthless director of the Bank of the World. She knows what Lupin is only beginning to discover: the ring is a map leading to a legendary brooch. This artifact supposedly grants its wielder extraordinary power and influence over world affairs, and past conquerors wielded it to reshape history itself. Cynthia intends to use it to engineer a global conflict that serves her interests. With Zenigata pursuing him through the streets and Nabikov closing in from the shadows, Lupin races to uncover the brooch's location first. What should've been another quick score becomes a desperate race against an enemy with resources and ambitions that dwarf his own.