It is 1943 in Paris. Like so many others, the Bourbelle family's home has been taken over by the Germans and they now live in their cellar. Little do they know that the son, Guy-Hubert Bourdelle, is far from being the cowardly hairdresser he pretends. He is in truth the Germans’ most feared opponent: le super-résistant!

Pivoine, a 13-year-old girl, tired of her parents' arguments, reluctantly goes on vacation with them. She takes advantage of an accident on the highway to run away from them and take her legs. She meets a young legionnaire, Rouquin, also on the run. Together and in complicity, they will flee, trying to escape the highway police, and will love each other without saying it...