It is 1979 and Albertine, 10, and all her family members have gathered in Brittany to celebrate the birthday of her grandmother. Everyone thinks that the Skylab space station from NASA will fall on their heads this summer. The meeting turns into a crazy weekend full of revelations, love and song.

An elderly woman wants to meet her son’s murderer. A sixteen-year-old girl who has crossed paths with a young hoodlum needs an adult to accompany her to the prison visiting room. A young medical supplies delivery man is offered a deal to take the place of a gangster inmate so that the latter may escape. Two women, one man, three destinies that come together in the visiting room of a prison…

Ariane is convinced that her boyfriend, Jean-Jacques, is having fantasies about another woman, Élisabeth. In an attempt to save their relationship, Ariane encourages Jean-Jacques to pursue Élisabeth, believing that this is the best way to free him from his own desires. Jean-Jacques presents himself at Élisabeth's house, not realising that she is the daughter of the French President.