A young boy disappears after school. Is it a runaway? An abduction? Faced with the impotence of the police investigators, the grandfather comes to Paris and introduces himself into the world of child prostitution and drugs.

The students of a local school unite in mutiny against their headmaster and two teachers.

Zoe, a young girl with musical interests, works in a hamburger restaurant. She auditions several times to sing in a cabaret but these do not work out because she does not agree to the requests of the owners of the place. After her disappointment, she meets the members of a recently created rock band that is going through a slump of inspiration and popularity. Zoe joins the group and becomes their creative muse, achieving great success with them under the name of Sandy.