Margery Booth: The Spy in the Eagle's Nest
From Franz von Habsburg FBKS MScAbout the film:
The astonishingly true story about English opera star Margery Booth who becomes Hitler's favorite and is chased by him back stage bearing red roses, but little does he know she is working for British Intelligence and manages to get the secrets of his Tiger Tank back to England. Thrills from beginning to dramatic end when she faces torture by the Gestapo.