Once Germany's most eligible and lauded heiress, Clara Falkenberg earned the nickname "the Iron Fräulein" during World War II for her role operating her family's ironworks empire. Two years after the war, Clara is still using a false identification card, and finally decides to return home and take refuge with her friend, Elisa. Joining with a charismatic black marketer named Jakob—who is also looking for Elisa—Clara needs to stay ahead of a British agent who intends to arrest her for war crimes.