Most Secret War is R V Jones's account of his part in British Scientific Intelligence between 1939 and 1945. It was his responsibility to anticipate the German applications of science to warfare, so that the British could counter their new weapons before they were used. Much of his work had to do with radio navigation, as in the Battle of the Beams, with radar, as in the Allied Bomber Offensive and in the preparations for D-Day and in the war at sea. He was also in charge of the British intelligence against the V-1 (flying bomb) and V-2 (rocket) retaliation weapons and, although fortunately the Germans were some distance from success, against their nuclear weapons.