A small-time thief steals a car and impulsively murders a motorcycle policeman. Wanted by the authorities, he reunites with a hip American journalism student and attempts to persuade her to run away with him to Italy.
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 departure of the German army from Paris in 1944.