Two ambitious parents decide to change their name for a foreign patronymic so that their young son Edmond can win fame easier.He's a eleven-year -old orchestra conductor.But the child ,from working-classes,regrets his past life and finds it hard to adapt himself to his sumptuous new existence.He becomes friend with a group of brats he sees play under his windows.The young prodigy is abducted by the valet's sidekicks.Panick-stricken,the parents cannot raise the 15 million ransom demanded by the kidnappers.But the son's new chums investigate.