In the picturesque village of Adèle Beaumont, life follows its peaceful course until war breaks out and her husband, Théo, is called to the front. The letters they exchange become their only link, a refuge from the horrors of war. Adèle, faced with loneliness and the trials of everyday life, draws her strength from the hope of Théo's return. Meanwhile, Théo, faced with violence and the loss of his comrades, desperately clings to the love of his family. The letters become a witness to their hopes, their fears and their unwavering love, an echo that crosses distance and time.