Josepha is on the verge eighteen living with her drunken washed up actor uncle. She longs for the companionship of a group of her mo-ped riding peers who dabble in activities on the shady side of a legal dividing line. In order to get the semi-delinquent group to accept her, Josepha runs to the police with a tall tale about the local druggist, Savary. The police are looking for a sex murderer, and Josepha insists Savary is their man. What she does not know, however, can do her considerable damage.

The film follows four families, with different nationalities (French, German, Russian and American) but with the same passion for music, from the 1930s to the 1960s. The various story lines cross each other time and again in different places and times, with their own theme scores that evolve as time passes. The main event in the film is the Second World War, which throws the stories of the four musical families together and mixes their fates. Although all characters are fictional, many of them are loosely based on historical musical icons (Édith Piaf, Josephine Baker, Herbert von Karajan, Glenn Miller, Rudolf Nureyev, etc.) The Boléro dance sequence at the end brings all the threads together.