If you’re in the mood for something unusual—a kind of wacky playfulness combining elements of Laurel and Hardy with Ingmar Bergman, mixed with a touch of “Mary Poppins”—then this might be worth your time. The story unfolds on the coast of La Manche, where people are starting to vanish without explanation. "Insp. Machin" (Didier Després) and his partner "Malfoy" (Cyril Rigaux) are brought in to look into it. Their focus quickly turns to an area where the sea meets the Slack river, home to a family of oyster farmers living near the mansion belonging to the wealthy Van Peteghem family. This family—they’d seem perfectly at home in the opening scenes of John Boorman’s “Deliverance” (1972)—mostly ignore the people around them and live indulgent lives, openly displaying their wealth to those less fortunate. The plot thickens when a local boy named "Ma Loute" (Brandon Lavieville) develops an interest in the mysterious "Billie" (Raph), which not only violates the unspoken rule keeping locals separate from wealthy visitors but also makes things more difficult for the investigating officers. The policeman, who has a tendency to puff up like “Aunt Petunia” from “Harry Potter” when he’s uneasy about a case, finds his work complicated by the eccentric Van Peteghem family, led by the delightfully unhinged "André" (Fabrice Luchini) and "Aude" (Juliet Binoche), who seems set on creating a blend of Katharine Hepburn and Dame Margaret Rutherford as she playfully overacts. It turns out that almost everyone has secrets as the story progresses, and while the humor isn’t exactly delicate, its extreme nature keeps things moving along entertainingly, even if it feels somewhat uneven at times, toward an ending that Luchini himself attempts to explain to a confused audience and family. The resolution felt a little hasty and, in my opinion, wasn't fully developed—but the film is full of spoofs, boasts a wonderful score, striking visuals, and clever design, and there were a few silly moments that genuinely made me laugh as it satirizes the rich, the poor, sexual ambiguities, and taboos, generally providing an enjoyable experience.

Source on TMDB