La Maîtresse en Maillot de Bain plot
The three thirty-somethings Jean, Karim and Eric have been friends ever since they secretly immortalized their busty teacher in a bathing suit on the school wall when they were very young (a 'tag' they now defend tooth and nail against the local park department). They live in a boring provincial town near Lyon, where they occasionally go to experience something. Likewise if they accidentally (a theft that they could not let go) come into possession of a professional camera. However, it is not possible to sell the camera in Lyon because they do not know the local healers circuit as occasional thieves. However, they accidentally film a robbery by a few gangsters, which gives them the unfortunate idea of blackmailing the crooks...