František Kopal

Tram driver Marie has far too much to do after her shift is over. But she likes to do it all since she loves her husband Václav sincerely. One day she spots him on the Lesser Town Square in Prague, kissing an attractive blonde good-bye. It seems to Marie that her small comfortable world has collapsed and she walks out of the tram in tears. But her sadness does not last long. She wipes off the tears and begins to act. She withdraws all the money from their savings books and buys off all the latest models from the Fashion Works. The visit to the beauty salon then completes her transformation into a lady.

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...