The first days of WWI. Adrien, a young and handsome lieutenant, is wounded by a piece of shrapnel. He will spend the entire wartime at the Val-de-Grâce Hospital, in Paris. Five long years, and his life will change forever…

Paris, 1960s. Momo, a resolute and independent Jewish teenager who lives with his father, a sullen and depressed man, in a working-class neighborhood, develops a close friendship with Monsieur Ibrahim, an elderly Muslim who owns a small grocery store.