Placek (Josef Kemr), the head of research in a chemical plant, appreciates the help of his younger colleague Bernát (Alois Svehlík) in the creation of a new synthetic material.
A tram pasted with posters travels through Prague. The mounted loudspeakers invite passers-by to a series of concerts of Giuseppe Verdi's masterpieces. On the tram a party of young people is getting drunk.
