In the bustling city of Budapest during the 1930s, a captivating story unravels at a charming restaurant owned by Laszlo. Seeking to elevate the dining experience, Laszlo decides to bring in the talented pianist, András, to serenade guests with his melodic tunes. It is here that the fates of three individuals become intertwined in a complex dance of love and desire. As András showcases his musical prowess, he becomes enchanted by the enchanting beauty of the waitress, Ilona. Inspired by her grace and allure, András is inspired to create his most poignant composition - a mesmerizing piece known as Gloomy Sunday. However, what begins as a tale of love and passion soon takes a darker turn as the haunting melody of Gloomy Sunday becomes synonymous with tragedy. The restaurant's delicate equilibrium is shattered when a German patron named Hans arrives and finds himself captivated by Ilona's charms. As Hans vies for Ilona's affections, the dynamics of the ménage à trois are thrown into disarray, sparking a tumultuous chain of events that will forever alter the lives of those involved.