The family of Prague burgher and master interior decorator Václav Kondelík lives happily in their house on Ječná Street. The peace is disturbed by an invitation to an "apron party", where their daughter Pepička meets a young municipal official, František Vejvara. The two young people fall in love. Their relationship is also supported by Mrs. Kondelíková, because Vejvara could become a welcome groom for her daughter. However, Pepička's acquaintance disrupts the established order of Kondelík's life.