Oskar Matzerath is a very unusual boy. Refusing to leave the womb until promised a tin drum by his mother, Agnes, Oskar is reluctant to enter a world he sees as filled with hypocrisy and injustice, and vows on his third birthday to never grow up. Miraculously, he gets his wish. As the Nazis rise to power in Danzig, Oskar wills himself to remain a child, beating his tin drum incessantly and screaming in protest at the chaos surrounding him.

1944. Léon Duchemin owns a restaurant with his sister. His clients are Germans, Résistance et black marketeers. Léon unwillingly joins the Résistance when a British pilot is shot down and hides in his attic and, through a series of mishaps, he accidentally steals the plans for Hitler's V1 missiles.

In August, 1944, during the landing of Provence, a french soldier, too young to wage war, meets a Senegalese Tirailleur in combat.