The epilogue first follows members of Churchill's inner circle through the later war years. Mary Churchill serves on a heavy anti-aircraft battery in Hyde Park, worrying Clementine but earning her pride, and by 1944 Mary commands 230 female volunteers. John Colville finally wins Churchill's permission to leave No. 10 for the RAF, trains as an aircraftman, flies reconnaissance Mustangs, survives near misses, and returns twice to secretarial work, his active service changing how the Churchill family sees him.

Other close associates also reach turning points. Beaverbrook, after many resignation threats, finally leaves government in February 1942; Churchill later praises both his aircraft-production achievement and his companionship. The Prof, Frederick Lindemann, is vindicated when later analysis shows German and British air strength had been much closer than feared during the Battle of Britain, though his campaign for aerial mines fails. Colville's later life carries Churchill's world into peacetime: Churchill urges him to accept service as Princess Elizabeth's private secretary, and Colville eventually publishes the diary that preserves Downing Street's inner life.

The chapter then traces Pamela Churchill's affair with Averell Harriman from wartime London onward. Their relationship is widely known but tolerated, partly because Harriman's intimacy with the Churchill family has political value; Randolph Churchill remains unaware for a time even while praising Harriman. Once Randolph learns the truth, his already damaged marriage collapses into bitter quarrels, he is expelled from the Annexe, and by late 1942 the marriage is effectively over. Harriman supports Pamela financially, the affair cools when he goes to Moscow, and after decades of separate lives and other relationships, Pamela and Harriman finally marry in 1971.

Larson also closes the loop on several German figures. At Nuremberg, Hermann Goring is condemned for war crimes, remains boastful and unrepentant, and kills himself with cyanide before his execution. Joseph and Magda Goebbels poison their children and themselves in Hitler's bunker, Hitler having killed himself the previous day. Rudolf Hess receives a life sentence and eventually dies by suicide in Spandau, while fighter ace Adolf Galland survives the war, is captured, and later meets Douglas Bader again in Britain.

The final sections return to Churchill himself. A small domestic scene, in which Churchill gleefully urges a toy-train collision for Winston Junior's set, shows the boyish delight that survived inside the wartime leader. On May 8, 1945, he announces victory in Europe, is cheered by the No. 10 staff and by immense crowds, and appears with the king and queen to a roar that confirms his place as the public face of Britain's endurance.

Yet triumph is immediately followed by loss. In July 1945 the British electorate removes Churchill from office, judging him better suited to war than reconstruction, and the family spends a sorrowful final weekend at Chequers. Mary watches her father wander without work and records her heartbreak as music gradually calms him; the family signs the visitors' book one last time. Churchill closes his own entry with a single word, "Finis," giving the book its final note of victory shadowed by abrupt displacement.