In 18th century Bohemia, the mercenary troops of a cruel duke roam the countryside. A cap maker who defends himself against injustice is thrown into prison. His ten-year-old son tries to free his father with the help of his friends of the same age and a magic cap, but the duke's henchmen are soon after the magic cap.

Czechoslovakia 1918. The newly formed National Assembly has made Stoklasa the administrator of the Kratochvile Castle. Although with no aristocratic background, he is a man of fortune and is trying to buy the castle. To impress his neighbors and the local politicians he invites them to a great hunting party. Uninvited comes a man who claims to be Duke Alexej. Stoklasa believes him to be a hustler. This hustler, however, manages to charm all the women before he leaves.

Pan Tau, the friend of all children, now also helps the adults. A movie producer is in trouble and decides to shoot another Pan-Tau movie. But the old Pan-Tau actor Karasek is no longer young enough to walk the almost weightless walk of Pan Tau. Mr. Novak turns up - he resembles Pan Tau like a twin brother. He succeeds every pirouette. And as if by magic, he solves all the problems between people! Who is Mr. Novak? Is he really ...?