Even before the phone calls from the CIA and Scotland Yard, theories about Sue had been bubbling up in the minds of those who knew her. Could she have been a member of the IRA? Or an informant for British intelligence? WITSEC? We speak with intelligence experts and try to understand our mystery woman.Under Cover of Knight is an Apple Original podcast, produced by Spoke Media and Castleview Productions. Listen and follow on Apple Podcasts.apple.co/UnderCover