A man and a woman from a different planet come to the Earth to get a cure for a disease that is apparently threatening to eradicate their civilisation.
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.
Prague - mystical city. It was here in the Middle Ages, alchemists and magicians gathered. Rumor has it that the house of Prague hide secret obtain the philosopher's stone, and complex multi-level labyrinth of underground tunnels and cellars keep many unsolved mysteries and untold treasures. Prague just full of ghosts and phantoms. Let us slightly lift the veil that hides the secrets and little to satisfy your curiosity, get acquainted with some legends of Prague.
