With a wealth of fresh research, interviews and newly discovered sources, Sonia Purnell unveils for the first time the full, spectacular story of how she left an indelible mark on the world today. At age 20 Churchill's beloved daughter-in-law became a "secret weapon" during World War II, strategically wining, dining, and seducing diplomats and generals to help win over American sentiment (and secrets) to the British cause against Hitler.