The woman seems so calm, so cool, until the slap. For the bulk of Fatherland, the latest film from Oscar-winning Polish filmmaker Pawel Palikowski (Ida, Cold War), Sandra Hüller is the human pillar of the movie. In real life, her character Erika Mann was a war journalist, a racecar driver and, like Hüller, an actor. In Palikowski’s movie, she’s the chauffeur and caretaker of her father Thomas Mann, as the celebrated German novelist returns to the broken, now-bifurcated country of his birth. (Erika did not actually accompany the exiled Death in Venice author on his trip back to Germany in...