While in Bohemia, an American industrialist named Craigs goes missing. In Prague, the police have arrested a man without identification, who bears a striking resemblance to Craigs. The doctor, the secretary, and the hotel staff all claim that he is the industrialist. The man denies this claim. When he learns how harsh and despotic the man he is believed to be is, he agrees to go to London and adopts his new identity.

A very hardworking but also very naive insurance company clerk, Valentin Plavec, becomes the target of endless pranks, jokes and recessions from his colleagues Bejšovec and Voborník. However, their last successful trick somewhat gets out of hand. They add a one to the winning number 8456 and convince Valentin that he has won a million in the lottery. However, since Valentin cannot collect his winnings immediately, he withdraws twenty thousand, which is all the savings he has saved together with his fiancée Helena, and starts shopping for a deposit. However, the truth soon comes out and when his colleagues reveal to him that it was just a joke, they all leave him, only the faithful Helena stays and even helps the unfortunate fiancé cancel all the deposits and agreed deals. When the newspaper reports that there has been a mistake and the winning ticket is number 18456, Valentin decides to take revenge on the two pranksters...

The heroes of the Czech film comedy are the students of the Business Academy, who sleep in the school desks under the avalanche of a large amount of study material, without which they say they will not be able to do without in their future profession. One of the least popular teachers is the strict and unyielding Professor Wolf, proud of his textbook. Nevertheless, student life is relatively calm, but only until the holidays come and the students go directly to the field for their holiday practice. The film follows how unhappy the first encounter with business reality turned out for three of them, for Karel Zeman, Ivan Javorský and Vašek Pelíšek...

Young civil servant Marta Urbanová wins a two-week stay at a luxury hotel. While looking for a typing room, she accidentally finds herself in the suite of the Minister of Finance, who mistakes her for a typist. Marta complies with the request of the Minister's secretary Diviš and stays to take dictation...

Czech-American professor Johny Novák takes over his father's inheritance. The estate reveals that Johny is the father of a girl who lives with her mother Helena Strnadová in Prague, where Johny had stayed eighteen years earlier. Johny's father did not approve of his love and so he withheld Helen's letters, but he sent money to Helen's aunt for the child. Johny intends to visit Helen and her daughter with his friend Jimmy Sládek and informs his aunt about it by telegraph...

Folk song collector Dr. Šerk arrives in the remote village of Lesov. He is enchanted by the singing of sixteen-year-old Madla Satranová and he records her songs for radio broadcast. Šerk's friend, composer Jaroslav Klán, takes care of a group of orphans, from whom he has formed a choir. Šerk brings the orphaned Madla to him. The teenage girl begins to help the housewife Nána with the care of the children.

The imperial councilor Ullik decides to modernize his old mills by installing a new turbine. His eccentric brother-in-law Artuš tries to prevent this, as the construction work disrupts the statics of the tower in which he lives. Ullik's older daughter Tynda is a talented singer. The bewitched girl secretly accepts the courtship of the virile Václav, the son of the night watchman. Her younger sister, the doctor Marie, wins the heart and hand of the astronomer Zouplna, despite her father's prohibition...