Winston Churchill's aristocratic daughter-in-law and confidante Pamela Harriman is considered "the greatest courtesan of her era". Decades after her death, she still divides opinion – was she a smart power player, or "shameless" and "repellent"? You could call her by her six names: Pamela Beryl Digby Churchill Hayward Harriman – a British aristocrat who ended up a Washington power player and the US ambassador to France, having touched many famous lives in 20th-Century politics and culture. When she was just 20, her father-in-law Winston Churchill engaged her as "his most willing and committed secret weapon" (as a new biography puts...