Set in pre-World War II Budapest, GLOOMY SUNDAY is a romantic melodrama that evokes the haunting melody of the same name, fabled to have caused over one hundred suicides in the 1930s. Before the dark days of the war, Laszlo (Joachim Krol), a Jewish restaurant owner, enjoys a successful business while happily living with his lover and the restaurant's sultry hostess, Ilona (Erika Marozsan). When they decide to hire a restaurant pianist they meet Andras (Stefano Dionisi), a brooding composer who quickly captures the heart of Ilona. However, her love for Andras does not diminish her feelings for Laszlo and the trio embark on an agreed-upon ménage-à-trois that seems to be successful, at least on the surface. Andras's passionate love for Ilona inspires him to write "Gloomy Sunday" which becomes an overnight sensation and the restaurant's signature song. Ilona's beauty captures the heart of a third suitor, Hans Wieck (Ben Becker), a German customer who becomes a corrupt SS officer after the Nazi occupation of Hungary. Hans' friendship is a strategic necessity as the trio struggles to keep the restaurant open and Laszlo free from persecution while the threat of war looms.