Summer 1918. The First World War is drawing to a close when Léon Le Gall, a French teenager from Cherbourg who has dropped out of school and left home, falls in love with Louise Janvier. Both are severely wounded by German artillery fire, are separated, and believe each other to be dead. Briefly reunited two decades later, the two lovers are torn apart again by Louise's refusal to destroy Léon's marriage and by the German invasion of France. In occupied Paris during the Second World War, where Léon struggles against the abhorrent tasks imposed upon him by the SS, and the wilds of Africa, where Louise confronts the hardships of her primitive environment, they battle the vicissitudes of history and the passage of time for the survival of their love.