Goemon is coerced by Lupin into to winning the confidence of the young woman Chloé Cazal. She was apparently a close friend of the late Belgian millionaire André Regnie, who gave her an immensely valuable gem necklace made before the Russian Revolution, which has made Chloé a target for the descendants of its original owners. While looking for her in the town of Sirena (and struggling with the attention of a local Anicon's visitors), Goemon befriends a boy named Jean who lives in Chloé's neighbourhood. He moves into Jean’s parents' hotel to watch over her, spending all his money on expenses and fending off several hired assassins in the process. However, Goemon later discovers that the girl is actually the Chloé's daughter Inés, and that her necklace is a forgery. Inés had acted as bait to enable her mother to sell the real necklace. In the end, with no money left, Goemon asks to stay with Inés to work off his accumulated hotel bill.
