French girl Matilda (Audrey Tautou) is disabled due to polio. Manique (Gaspard Ulliel), a boy from the same village, is her childhood sweetheart. The two have already made an engagement, but with the outbreak of World War I, Manique enlists in the army and the engagement becomes a distant prospect. The war is long and cruel, but Matilda believes that there is a wonderful connection between her and Manique, and she firmly believes that Manique is still alive. In 1920, Matilda received bad news: five French soldiers were sentenced to death by their country's military committee for self-mutilation and thrown to the enemy's Twilight Bingo trench to wait for death. The youngest of them is Manique. Matilda began to find the truth with difficulty. She asked a private detective to investigate, asked someone to check the relevant military documents, and persevered in visiting the survivors of the Twilight Bingo trench, even exhausting the inheritance left by her parents. The search process was painful and long. Matilda seemed to have experienced the horror of war firsthand and learned more unknown secrets of the Dusk Bingo Trench.