At the Ronov castle, the archive-keeper professor Nykl (Milos Nedbal) is searching for the lost painting The Naked Shepherdess by the famous Fragonard. Nykl is just about to disassemble the mantelpiece in the knight's hall, convinced that the painting must be hidden somewhere inside. His efforts, however, meet the strong disapproval of the castle manager, Anna Juzová (Jirina Petrovická), who knows very well where The Naked Shepherdess is. She wants to get hold of the painting herself, to emigrate and smuggle it along. In fact, Anna deals with forgeries of the most distinguished old masters, selling them abroad. The copies are made for her by the painter and restorer Maudr (Martin Ruzek) and the certificates of authenticity are issued by Anna's companion - expert Laburda (Karel Höger). One day, Anna is found murdered in front of the castle's fireplace.
| Actor | Role |
|---|---|
 Karel HögerDr. Laburda | Dr. Laburda |
 Jiřina PetrovickáAnna Juzová | Anna Juzová |
 Bohumil ŠmídaNot listed | Not listed |
 Vladimír Menšíkkapitán VB Josef Tronda | kapitán VB Josef Tronda |
 Jan SkopečekNot listed | Not listed |
 Oldřich VelenNot listed | Not listed |
 Zdeněk ŘehořNot listed | Not listed |
 Martin Růžekmalíř Oskar Maudr | malíř Oskar Maudr |
 Jaroslav MarešNot listed | Not listed |
| EEva JandáčkováJudita | Judita |
| KKateřina KlumparováKvětuška | Květuška |
 Luděk MunzarNot listed | Not listed |
| EEva VlachováNot listed | Not listed |
 Jiří VondrovičNot listed | Not listed |
 Miloš NedbalNot listed | Not listed |
| ZZdeněk ProcházkaNot listed | Not listed |
| JJindřich BlažíčekNot listed | Not listed |
| KKlaudie FerbrováNot listed | Not listed |
| AAnny FreyováNot listed | Not listed |
| OOtto KinskýNot listed | Not listed |
| VVladimír LinkaNot listed | Not listed |
| LLibuše MatějováNot listed | Not listed |
| EEduard PavlíčekNot listed | Not listed |
 Gabriela VránováJudita (voice) | Judita (voice) |