Spying on the Royals (2017)

In 1935, suspecting that Edward was being blackmailed, King George V ordered his son to be put under surveillance. In 1936, the Home Office ordered MI5 to listen into the future king's phone calls.

After his abdication, Edward and Wallis holiday in America, unaware they are being tailed by US intelligence agents. The outbreak of war and dealings with a Nazi collaborator in Lisbon raise concerns for MI5.