Barbara's family is poor and she needs to come up with a way to pay the gas bill. At her job in a cinema she listens to the conversation of a cheating wife and her affair. Barbara offers the husband of the cheating wife, a wealthy chemist, to help him get his wife back. Her plan is a bizarre sharade in which Barbara plays the role of the chemist's affair to make his wife jealous. Of course, this backfires in every way imaginable.

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…