At the year 1946, the time of the Nuremberg Process. One of the main actors of the Second World War, who reportedly committed suicide, Adolf Hitler is, however, missing. The Czech doctor Herman (Karel Höger) is kidnapped from Prague and driven to the sanatorium of Professor Rolf Harting (Jirí Vrstála). The sanatorium is a disguised military stronghold, most probably occupied by a Nazi garrison, with prison cells and an execution chamber in the basement. At night, Herman is taken to a patient in whom he, to his horror, recognizes Hitler (Fritz Diez).

Country girl Pepina sometimes misses her boyfriend Ferd. He works for the detective company "Bdělá soůva" in Prague. Pepina takes the opportunity to visit Ferd when the filmmakers offer her to go with them. However, they accidentally run her over on the outskirts of Prague. Pepina is unfamiliar with Prague and just by chance gets lost in the theater where Ferd is on duty...

Jindřich Tůma, a partner in the gas mask shop "Asana", has a very energetic wife who promotes a vegetarian diet. The real soul of the company is Ing. Ivan Kareš, who also leads civil defense exercises. On the street, during a practice air raid warning, he sternly reprimands a girl who did not go to shelter. It is Věrka, the Tůma's niece, who comes from the countryside to finish her studies in Prague. Věrka enters the seventh grade and soon shares the enthusiasm of her classmates for an unknown composer whose pseudonym is Michal Marhan. Ing. Kareš gives a lecture on civil defense in the seventh grade and so meets Věrka again. Kareš tries to convince the girls of the necessity of more concrete life ideals. At the premiere of Marhan's operetta "Píseň o štěstí" it turns out that Kareš is the composer. The girls give him a standing ovation. Ivan ignores Věrka, with whom he has recently had a falling out. The stubborn girl therefore leaves for home...

Věra accepts the offer of her friend Kajetán, who arranges a position for her in Dominik's puppet factory. The spirited girl impresses her employer, Antonín Dominik, so much that he falls in love with her. Dominik's mother notices her son's interest in Věra and immediately fires her. Kajetán, who works in the studio of sculptor Výr, who is engaged in the production of mechanical puppets that can be used to advertise goods, asks Věra for help...

The main character of the funny story is an ordinary typist Julinka Svobodová, who works for the established business firm Hrubý a syn and lives in a sublet with the seamstress Mrs. Pokorná. Although she is poor and sometimes manages to be late, she is still cheerful and pleasant. However, a small coincidence is enough and everything changes. That is when she takes an elevator ride with the Minister of Trade, Dr. Horák, who coincidentally lives in the same building. Mrs. Pokorná, in good faith, hints to the inquisitive landlady that Julinka is the Minister's girlfriend. From the talkative woman, an innocent rumor spreads like wildfire and, surprisingly, it helps the girl in every way...

Adam Kavalír returns from abroad to take over the family factory from his father. But as a consequence of his father's bohemian lifestyle the business is so far in debt that the Kavalírs even lose their villa and must find a place to sublet. Mrs. Trojanová is no longer up to managing her pension, the co-owner of which is none other than her peevish daughter Eva, and she is looking for a capable manager. Adam applies for the position and is accepted.