After one of the grand parties at the cemetery, Grandma orders a clean-up. During a Polish language lesson, Mrs. Frał announces an inspection of the order in the students' pencil cases. She makes some surprising discoveries. In the meantime, the twins invite everyone to a performance that will take place at their home. Everyone is excited. The parents turn out to be two mothers-artists. Their happening concerns the topic of the cleanliness of the planet. The events will arouse extreme opinions among the audience. The teacher and most of the adults are outraged. Czesio, on the other hand, is delighted and after returning to the cemetery, he organizes his own performance. He invites the residents of the necropolis.