The television adaptation differs from the novel in many respects, completely omitting the section set in the 1970s. The story is told in flashbacks, with Stephen Wraysford's experiences in World War I alternating with his memories of his affair with Isabelle Azaire, a young married woman whom he met before the war when he was staying in her husband's house to learn about business. Stephen and Isabelle run away together when their affair is discovered by her husband, but she leaves Stephen after a short time. Stephen recalls these events when he is badly wounded as a result of an encounter with German sappers when he and his own men accompany the British tunnellers of the Royal Engineers underground. Left for dead, he is discovered and saved by Jack Firebrace, a working-class man with whom Stephen has previously felt little empathy. In 1916, Stephen is reunited with Isabelle as a result of a chance meeting with her sister Jeanne, shortly before his battalion goes "over the top" in the Battle of the Somme. Upset by the encounter, he takes his fellow-officer, Weir, to a prostitute, but neither man is able to obtain satisfaction. Weir plays a much smaller role than he does in the novel. During the battle, Stephen is again wounded and loses many of his men; Firebrace and Weir are among the survivors. Two years later, with the war drawing to a close, Stephen's men are preparing another mining expedition. He meets Jeanne, who tells him that Isabelle has died, but he also discovers that he has a seven-year-old daughter, Françoise, whose existence Isabelle had concealed from him. He is also disheartened by the death of his friend Weir, shot dead by a sniper. German miners, digging close by, lay a charge and Weir's men are unable to get out of the tunnel in time. Stephen and Firebrace are the only ones left alive, but their way out is blocked. They talk and share their experiences, Firebrace grieving for his dead son while Stephen confides in him that he has a daughter. Stephen finds some explosives and Firebrace, himself close to death, tells him how to lay them in order to blast their way out of the tunnel. Before Stephen completes the task, Firebrace dies. The explosion successfully clears a way out for Stephen, and he stumbles out of the mine to be confronted by two German soldiers, who tell him that the war is over. Unlike in the novel, Stephen meets Françoise before the war is over and Jeanne implores him to be a part of her life; after the war he is seen showing up at Jeanne's house to be with her and his daughter. Whereas in the novel Stephen is terrified of birds, the television adaptation does not explore this although birdsong is frequently heard.
Working Title held the screen rights to the novel for many years, but were quoted as saying "there is something afoot" after Faulks' 2007 commission to write a new James Bond novel. Shooting of war scenes took place near Gyúró, Hungary. Remains of the set can be seen on Google Maps.
