Architect Paul Thomas insinuates himself into the relationship of two bisexual women living in a St. Tropez villa with tragic consequences.
Charles Masson, an advertising executive, is having an affair with Laura, the wife of his best friend, the architect François Tellier. Charles strangles Laura when one of their S&M games goes too far. Dazed, Charles walks out of the borrowed apartment in Paris and soon bumps into François in a nearby bistro. They drive back together to Versailles, where they have beautiful neighboring houses designed by François.
Roland Wolf (Robin Renucci) poses as a reporter to interview a popular television personality (Philippe Noiret) he believes is responsible for the disappearance of his sister. The struggling actress had taken a job as a companion to the star's sickly ward Catherine (Anne Brochet). Roland discovers Catherine is being drugged by her benefactor who has stolen her inheritance and possibly committed murder.
Sophie, bonne analphabète et secrète mais dévouée, est engagée au service d'une famille bourgeoise de Saint-Malo. Son amitié avec la postière, curieuse et envieuse, va déclencher une série de drames.
Following a car accident, Paul Wagner suffers a head injury he is struggling to recover fully and can not manage his business of trading of champagne. Christine Belling advantage of the situation to try to sell the company, while Paul denies. Murders are committed: it is likely that Paul is the culprit. He then approaches Christine for her support. But she is murdered in turn. Paul is obviously the prime suspect in the eyes of investigators. Paul is suspicious of Jacqueline, his secretary, who is at the heart of this case. Jacqueline is related to Christopher, husband of Christine. We then discover that they have joined forces to divert capital from Paul Wagner.
Phillipe and Esther live an apparently idyllic life with their daughter, Elise. In an attempt to preserve this bliss, Phillipe decides that he and Esther should each have affairs, being sure to tell each other openly about them. The plan backfires with tragic results as Phillipe becomes engulfed in jealously.
Betty and Victor are a pair of scam artists. One day Betty brings in Maurice, a treasurer of a multinational company. Maurice is due to transfer 5 millions francs out of Switzerland, and Betty is convinced he plans to steal that money. On whose side is Betty - Victor's, Maurice's or only her own.