With the help of a social worker and Isabelle, Pierre, a delinquent influenced by Marcelle, undertakes a slow and difficult reintegration.

Towards the end of the 19th century, the Duke of Gerolstein traveled to Paris. Sixteen years earlier he had a daughter who was taken from him by her mother who was chased out of the palace. After many dramatic adventures, the Duke finds his daughter in the person of Fleur de Marie, martyred throughout her childhood by the Owl and the schoolmaster.