Marc Delvaux, a famous retired police commissioner, lives alone in a large building in the Lyon countryside on the banks of the Saône. When a lawyer friend asks him to house Emma for a while, a young woman who has to testify, he accepts without suspecting that he has just signed his return to the field.
Historical drama centred around the legendary Breton heroine Marion du Faouët who was born Marie-Louise Tromel in 1735 in the little village of Faouët in Brittany. She became the leader of a group of highway robbers.