Pada puncak perang dunia pertama, dua orang tentara Inggris muda, Schofield dan Blake diberikan sebuah misi yang kelihatannya tidak masuk akal. Berlomba melawan waktu, mereka harus melewati daerah musuh dan menyampaikan sebuah pesan yang akan menghentikan serangan mematikan terhadap ratusan tentara - di mana saudara laki-laki Blake berada di antaranya.

France, 1914, during World War I. On Christmas Eve, an extraordinary event takes place in the bloody no man's land that the French and the Scots dispute with the Germans…

In November 1918, a few days before the Armistice, when Lieutenant Pradelle orders a senseless attack, he causes a useless disaster; but his outrageous act also binds the lives of two soldiers who have nothing more in common than the battlefield: Édouard saves Albert, although at a high cost. They become companions in misfortune who will attempt to survive in a changing world. Pradelle, in his own way, does the same.

In Belleau Wood, France, during the Great War, a soldier named John writes a letter home to his wife Sara in Milwaukee. He writes that her picture "helps me remember what it was like to be me." He tells her about sorties into No Man's Land, and that they have orders tonight to charge. Then, his letter becomes a report of that charge: toward an armed German soldier who doesn't fire, even when John reaches him and jumps into the trench beside him. What happens next brings silence and an end to the letter.