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