H ere is an impossibly elegant, poised historical vignette whose brevity and control can hardly contain its characters’ personal and historical pain. It is directed and co-written by the Polish film-maker Paweł Pawlikowski and shot in lustrous monochrome by Lukasz Zal; it is a film about exile and betrayal, the impossibility of going home and of reconciling an artist’s children to their secondary importance. The setting is 1949 and the celebrated German novelist and Nobel laureate Thomas Mann – who fled the Nazis before the war for California exile and US citizenship – has returned home, first visiting Frankfurt (now in West Germany) to receive an award named after Goethe, whose birthplace this is. It is Goethe’s enlightened civilised wisdom and apolitical artistry Mann will pointedly evoke in his many elaborate speeches.…