The young detective notices a suspicious guy who holds a balloon with a skull on it. The guy buys a few boxes of matches and then tries to lift entire buildings. The boy calls the police. The boy is alerting the policemen. He doesn’t understand why do they handcuff him and then let him go and greet him. The boy doesn't give up and keeps his eye on the guy. A balloon explodes and reveals his prison uniform. An episode from a cartoon series for children titled ‘Na tropie’, written by Andrzej and Romuald Lach. A young detective is the protagonist of the series. The boy first observes the situation, then he goes into action at the crucial moment. Usually, he is guided by his imagination. On the other hand, he often feels responsible for the society. The series doesn’t include dialogues or commentary, the music was composed by Waldemar Kazanecki, who adjusted it to the mood of the story.