British actress, Clara Vine, is in Paris to film her latest movie, having left Berlin under a cloud. Joseph Goebbels has become increasingly suspicious that Clara has been mingling in Berlin society and passing snippets of information to her contacts in the British Embassy. It would have been absurd, if it hadn't also been true. With war becoming increasingly likely, Clara is approached by an undercover British operative, Guy Hamilton, who asks her to perform a task for her country: to befriend Eva Braun, Hitler's girlfriend, and to pass on any information she can gather. Clara knows to undertake this task is to put herself back in danger.