A los 33 años, Grace Kelly, una gran estrella de Hollywood, renunció a su carrera como actriz para casarse en 1956 con el príncipe Rainiero III y convertirse en Su Alteza Serenísima la Princesa Gracia de Mónaco. La historia se ambienta en plena crisis política y económica entre Francia y Mónaco, crisis en la que la actriz americana estuvo involucrada.
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.