Pierrot escapes his boring society and travels from Paris to the Mediterranean Sea with Marianne, a girl chased by hit-men from Algeria. They lead an unorthodox life, always on the run.
The third in a series of films featuring François Truffaut's alter-ego, Antoine Doinel, the story resumes with Antoine being discharged from military service. His sweetheart Christine's father lands Antoine a job as a security guard, which he promptly loses. Stumbling into a position assisting a private detective, Antoine falls for his employers' seductive wife, Fabienne, and finds that he must choose between the older woman and Christine.
A supposedly idyllic weekend trip to the countryside turns into a never-ending nightmare of traffic jams, revolution, cannibalism and murder as French bourgeois society starts to collapse under the weight of its own consumer preoccupations.
