Following World War I, Anna quietly mourns the death of her German soldier fiancé, Frantz. Her grief is ruptured when she witnesses a stranger, Adrien, laying flowers at her beloved’s grave. Desperate for a connection to Frantz, Anna casts aside her animosity toward Adrien’s French origins and envelops him into her life. She basks in the stories he unfolds of Frantz, and their friendship in Paris before the war. But when the true nature of his bond with Frantz is revealed, Adrien flees Germany, sending Anna on a journey to Paris after him.