Valentina Kovalova, a cousin to Tsar Nicholas, fled Russia in 1917 after Bolsheviks slaughtered her family. She took her infant son to Germany but left his twin brother whom she thought was dead. She married a man who became a close confidant and friend of Hitler.
As WWII commences, her husband commands a U-boat, and her sons fight on opposite sides. She moves in the inner circle of Nazi society while hiding Jews and occasional Allied soldiers in her home until Himmler discovers her involvement in the resistance.