en Cuevana 3. Mrs. Piskořová, co-owner of a debt-ridden boarding house, forces her daughter Klára to marry a wealthy elderly architect, Kacík, who has recently separated from his wife. However, Klára is in love with the waiter Prokop, who she does not know is actually a mining engineer. No one suspects that Klára's land, considered worthless, contains a coal deposit...