The lawyer is visiting a prison to meet with a violent criminal who has been condemned to death. During the visit, things turn bad, there is a riot where prisoners escape and the criminal escapes taking a lawyer hostage.
Nicolas Mallet, an inconspicuous and shy bank employee, one day successfully invites Marie-Paul, a young woman he hadn’t known before, in the streets of Paris to a café and sleeps with her the next day. When he tells his surprised friend Claude about the incident, the disillusioned and handicapped writer starts to guide him, leading Nicolas on a dazzling social ascent.
Gaston Bellus, is the director of a textile house, and the research laboratory makes a sensational discovery: the elastic fabric. This new discovery is used to manufacture new modern stretchable bathing suits. His daughter Clementine, enters the beauty pageant to represent France for the swimsuit launch. But scandal ensues when the public soon discover, the photos of the event in which this new revolutionary material is completely invisible on photographs & live television.
Lucien, a modest engineering student, discovers that his steady girl friend Mireille is using him to cover up her dates with Mario, an older man. Lucien wanders about the streets of Paris and meets Joëlle, a sophisticated teenager who supports herself with a job in a sleazy nightclub. It is late when they meet, and Joëlle invites Lucien into the club and demonstrates her stripping act to her one-man audience. A feeling of rapport develops as they go from place to place seeking entertainment; in the morning the two discover they have fallen in love. Mireille learns of the romance and, on a bet, plots with Philippe and other friends to break up the affair. Neither Lucien nor Joëlle, however, succumbs to the propositions of Mireille and Philippe. Later at a nightclub, Mario gives the appearance of seducing Joëlle. Enraged, Lucien rushes at him and they fight. Lucien is reunited with Joëlle--he has learned of the complexities of love, and she has acquired from him a sense of stability.
