Six Black Girls

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