Pamela Digby was just 19 years old when she agreed to marry UK prime minister Winston Churchill's only son, Randolph, on the day they first met. The union, short as it was, changed the course of her whole life. While their rush down the aisle was hastened by young Randolph's desire for an heir, it was Churchill's family who grew fond of the red-haired aristocrat during the anxious, long evenings of World War II. In fact, Pamela was so trusted by her father-in-law that she became his confidante and helped gather intelligence for him. Isolated and ravaged by conflict, Churchill's...