Budapest in the thirties. The restaurant owner Laszlo hires the pianist András to play in his restaurant. Both men fall in love with the beautiful waitress Ilona who inspires András 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.

Together in Rome to shoot a film, a German actress (McCormack) and an English actor (Pryce) contend with forces that complicate their romance as well as the production itself.

Based on the true story of a Russian serial killer who, over many years, claimed over 50 victims, mostly under the age of 17. In what was then a Communist state, the police investigations were hampered by bureaucracy, incompetence and those in power. The story is told from the viewpoint of the detective in charge of the case.