Basada en textos reales sobre juicios inquisitorios, esta película tiene como argumento el narrar las atrocidades que cometía la Inquisición sobre personas inocentes, y que por alguna razón eran catalogadas como brujas, herejes ó hechiceros.
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.
The young Prince Charles (Jaromír Hanzlík), the future King of his country Charles IV, is being educated at the French court in the company of his fiancée Blanche (Daniela Kolárová). One day he receives a summons from his father John of Luxembourg (Milos Kopecký) in Italy. He leaves for Italy accompanied by a deputation from Bohemia. On the way the prince's company fights a battle with armed Milanese against heavy odds. Thanks to Charles's perspicacity, the prince's almost naked soldiers win through. In Lucca in Italy Charles joins his father, and here he experiences an amorous adventure and escapes from the traps laid by the Italian rebels.
Dos chicas jóvenes concluyen, mientras toman el sol en bikini, que "si en este mundo todo está corrompido, estaremos corrompidas nosotras también". Así se activa el mecanismo que pone en marcha la película: una tras otra, se irán produciendo escenas inconexas en las cuáles las dos protagonistas juegan a ser malas con su entorno. Engañan a hombres maduros para comer gratuitamente, escriben y dibujan en las paredes de su casa, improvisan un baile en un cabaret para boicotear el número que está en escena, engullen y despedazan los manjares de un banquete preparado para otros. Rompiendo toda linealidad narrativa y empleando la técnica collage tanto a nivel visual como auditivo.
