1913, Budapest, in the heart of Europe. The young Irisz Leiter arrives in the Hungarian capital with high hopes to work as a milliner at the legendary hat store that belonged to her late parents. She is nonetheless sent away by the new owner, Oszkár Brill. While preparations are under way at the Leiter hat store, to host guests of uttermost importance, a man abruptly comes to Irisz, looking for a certain Kálmán Leiter. Refusing to leave the city, the young woman follows Kálmán's tracks, her only link to a lost past. Her quest brings her through the dark streets of Budapest, where only the Leiter hat store shines, into the turmoil of a civilization on the eve of its downfall.