The book studies the use made by the British government of its envoy, immured inside the Vatican from 1940 to 1944, and what the envoy made of such opportunities during the Second World War to help the Allied cause. We see the Vatican, the Fascist Italy, from 'inside', and so gain a new and rare perspective into the predicament of the papacy. Owen Chadwick gives insight into the workings of the Vatican, including such questions as the struggle to keep Italy out of the war, the relations between the Vatican and the Fascist government, the use which the British sought to make of Vatican radio, the question of condemning atrocities, the bombing of Rome, the fall of Fascism, the armistice between the Allies and Italy, the German occupation of Rome, and the escape line for British prisoners of war. The author has used several groups of hitherto unexplored archives, and makes a fresh contribution both to the history of the Second World War and to the modern history of the papacy.