

Marthe and Ludovic playfully arrange to meet by chance at a restaurant with their respective families, to see how Pascal and Karine react. Although their relationship is platonic, Pascal and Karine begin to grow jealous. They enjoy each other's company so much that they decide to take the rest of the day off together to go shopping and see a movie.


Later that week, Marthe and Ludovic meet for lunch, buy bathing suits, and go swimming in a public pool. On the way back from the cemetery, Marthe and Ludovic get better acquainted, with Marthe revealing that she enjoys swimming and singing. At the funeral, Ludovic's father arrives and extends his condolences he too lost his spouse recently. During the slide show, Martha's mother's new husband dies.

Sometime later at a family gathering at Marthe's mother's house, Ludovic's daughter, Nelsa (Catherine Verlor), shows slides she took at the wedding-including compromising photos of Pascal and Karine. When Marthe tells him she knows about Karine, he says he only had her "three times in the bushes." Later, Pascal shamelessly informs her that he's broken off all of his affairs and that, from now on, she will be the only one. Ludovic meets Marthe for lunch and tells her that her husband is having an affair with his wife. Eventually, Pascal and Karine show up, slightly disheveled, and the couples part. Later, they dance together, even after the lights are turned off. While they wait, they get to know each other: Marthe is a secretary and Ludovic is a dance instructor who changes his occupation every three years. After a raucous wedding reception with plenty of dancing and drinking, Marthe and Ludovic are left waiting for their respective spouses, Pascal ( Guy Marchand) and Karine ( Marie-France Pisier), who are off having sex. Marthe is the bride's daughter and Ludovic is the groom's nephew. Two cousins related by marriage, Marthe ( Marie-Christine Barrault) and Ludovic ( Victor Lanoux), meet at a family wedding for the first time.
