A model Communist village is visited by a flying saucer.

Láda Pitras (Ludek Sobota) and Oto Vacák (Petr Nározný) founded in the company Pragokov a Research department of recruitment of labor. For recruitment of workers in professions sought after both recruiters worked out an effective, often almost illegal methods. They followed secretly for instance the welder Niederle and managed to record his lovesick courting to his colleague Anicka. The fear of his jealous wife made him to join Pragokov.

The firemen of a provincial Czechoslovakian town throw a ball in honor of the old chief's retirement. There will be music and dancing, a beauty pageant and a raffle. The whole town will be in attendance. However, the proceedings are dogged by difficulty at every step. Workplace injuries, stolen prizes, a shortage of pretty girls... and fire.

A baleful limping man walks through Prague. He is Asmodeus (Juraj Herz), the fiend of lustfulness, entertaining himself by putting together by magic couples of lovers. He only fails at the swimming pool. Zuzana (Jana Sulcová), the good-looking blonde, ignores the men whom the devil foists off onto her. She loves Honza (Václav Neckár) and the boy shares her feelings. The fiend is annoyed by the couple and tries to provoke a row. He sends heavy rain to force them into a hotel and then warns Zuzana's father by phone, but the young lovers manage to get out in time. Then the obstinate Asmodeus takes Honza in his sleep to the Institute for Emotional Disorders, where he shows him the ugly sides of love - hysteria, voyeurism, fetishism, suicide attempts...

Detective Lieutenant Boruvka (Lubomír Lipský) is called to the State Scientific Library to investigate the loss of a precious manuscript, the Infernal Psalter of the Occult Sciences by Master Peregrinus from the eleventh century, written in a secret script which has only recently been deciphered by senior lecturer Zajíc (Josef Chvalina). Chaos is reigning in the labyrinth of passages and halls of the former monastery where the library is housed. In order to save space the director of the library has introduced a peculiar system. The books are arranged in the bookcases according to height and six girls dressed in black, the library assistants, are quite happy to cut volumes down to size in case of need. Boruvka refuses the case, since he is specialist in murders. He has to return to the investigation, however, when senior lecturer Zajíc disappears.

Mr. Novak tells a lie to his neighbor Mrs. Bartackova that her husband is unfaithful to her and that is how it all started.