Budapest in the thirties. The restaurant owner Laszlo hires the pianist to play
in his restaurant. Both men fall in love with the beautiful waitress Ilona
who inspires to his only composition. His song of Gloomy Sunday is,
at first, loved and then feared, for its melancholic melody triggers off a chain
of suicides. The fragile balance of the erotic ménage à trois is
sent off kilter when the German Hans goes and falls in love with Ilona as well.