Dominique Faysse

Gilles and Christine a boy and a girl live in the outskirts of Paris, their families are ineffective and distant and they lead a purposeless life. They steal some records in a supermarket but she is caught and sent to a nursing home by force by her parents. She escapes and follows Gilles to a house where some other youths live. They then decide to go south: Christine has been told there is a commune there, where artists live. So they head south sleeping rough... (imdb)

Hélène Duvernet (Jane Birkin ), the owner of an art gallery, is questioned by inspectors Pelissier and Leroux. But Leroux develops a passion for Helena, and begins to take any excuse to talk to her and watch her. He joins her unexpectedly several times, and even steals her car so that she'll go to the police.