Yoko is upset when her father remarries and begins rebelling against her new stepmother. First, this is accomplished by promiscuity and partying but eventually her schemes take a much darker turn.
Industrialist Sood's manager Vishal gets expelled for siphoning off money from the company. To seek revenge, he kidnaps Babloo, one of Sood's twin sons, and inducts him into the criminal world.
Symphonie mixes fiction with reality. The author, Romain Schneid, tells the story of his own claustrophobia in front of the camera when, when he was 12 years old, hiding as a Jew during the German occupation, he could not leave a tiny apartment.