Frédéric is arrested for illicit use of narcotic drugs. In jail, he meets he get up close with various sorts of people among which he looks for a role model as a 18-year-old boy.
Lucien Hastier, known as "Lulu", is a locksmith in La Courneuve and a communist activist. He had never known his parents and had been raised by the public assistance, a notary comes to announce that his father died and left him an extraordinary inheritance: a castle, a title of duke and a royal filiation. But problems arise, the deceased duke has left heavy debts and suitors to the title.
