Edward VIII is best remembered as the King who gave up the throne to marry the woman he loved, American divorcee Wallis Simpson. But recently declassified FBI files reveal a more damning legacy: that Edward VIII and Wallis Simpson were pro-Nazi; that they maintained contact with Hitler’s Germany throughout the war, passing secrets to the enemy. They show that Edward planned to return to England as Hitler’s ‘puppet king’. The files also reveal the extent to which the British government saw this couple posing a significant threat to national security, with Churchill going to extraordinary lengths to send them into virtual exile.