Set against the backdrop of World War I, this epic love story follows Stephen Wraysford (Eddie Redmayne), an Englishman whose failed love affair with Frenchwoman Isabelle Azaire (Clémence Poésy) continues to haunt him during the war. His only respite comes in the form of friendship with Jack Firebrace (Joseph Mawle), a fellow soldier who helps Stephen endure the hardships of war and come to terms with his feelings for Isabelle.