This episode reveals that, as well as British spies following Edward VIII and Wallis Simpson's every move as they travelled across the Atlantic, the Americans were also on their trail. When Britain's former King Emperor Edward VIII - uncle of Queen Elizabeth II - and his wife, the American divorcee formerly known as Wallis Simpson, arrived at an exclusive American resort for a holiday, they thought they were enjoying every intimate moment of their trip in complete privacy. This programme can reveal for the first time how they were, in fact, being tailed, their phone tapped and their room bugged.