In may 1940, the German troops enter France. Frightened by the progress of the enemy, the people of a small village of Pas-de-Calais decide on the recommendations of the prefecture, to give up everything to go on the road, fleeing to the coast.

Mitraillette is 12 years old and lives in Rose City, a housing estate he would not leave for anything. His whole world comprises his family, especially his 16 year-old cousin Isma, who has taken a fancy to Narcisse, the local crime boss. His older brother Djibril is 22, a student at the Sorbonne who dreams of becoming a lawyer. As for Mitraillette, he has his eye on Océane, the most beautiful girl in his school...