Quick recap
Arlette, a young Paris model, is kidnapped after a fashion show and taken to a mansion where she's robbed and locked up. She escapes but can't point out where the house is. The clues lead to the Mélamare family's townhouse, and the family denies everything. Jean d'Enneris, who is Lupin, takes the case with Inspector Béchoux. Similar cases turn up in the past, always tied to the same family, and the mansion seems to exist and not exist at once. Lupin has to figure out the trick, protect Arlette and find who's behind it before she's taken again.
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