Quick recap
Fifteen years ago, singer Élisabeth Hornain was murdered at a château during a party, and her necklace vanished. The case was never solved. Now Raoul d'Avenac, who is Lupin, buys the château and gathers the old guests to replay that night. Meanwhile a cabaret singer named Antonine turns up in Paris with the dead woman's smile, and Inspector Gorgeret ties her to a gang of crooks. Raoul gets close to her, throws the police off and tries to learn who killed Élisabeth and what the double smile is hiding.
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