Shortly after WWII, the DEFA Studios produced a series of operas and operettas which belonged to the classical German musical heritage. This enchanting film, the very first opera production of DEFA, stands out because of its lavish decor and costumes, its outstanding actors and their masterful voices of that time.

Bohemia in the 19th century, stage-coach driver Hans loves the mayor's daughter Marie, but she is promised Wenzel, the son of another wealthy farmer. Marie refuses to marry Wenzel because of Hans, but the marriage arranger tries to "buy" Marie from Hans. But when Wenzel tells Hans that he doesn't want to marry Marie either because he loves circus director Brummel's daughter, Hans decides to accept the offer of money for not interfering in the relations of Hans and Marie. But when Marie hears about this, she doesn't want to see Hans again.

On the eve of the Russian Revolution, a performance of "Tosca" is taking place at the opera house. The artists and staff are too engrossed in their work to notice the unrest in the streets. The leading roles are played by Marina Marta and René Areno, who are also lovers. However, Marina has another admirer in Captain Alexander von Harbin. When, during the final performance, the insurgent communists suddenly storm the opera house, Alexander seems to be Marina's last hope…