Good-looking Edita Beningerová (Jana Brejchová) arrives at a chemical factory in the North Bohemian town of Ústí nad Labem together with her young assistant Nada (Zlata Adamovská). She is hoping that her ex-husband, outstanding practical chemical engineer Vik Panc (Eduard Cupák), will help her conduct an experiment to validate her proposed theoretical method of isolating cholesterol from lanolin. The success of Edita's invention is crucial for her career at the Prague Institute of Chemistry. Vik's roommate from his hostel Bréta (Ivan Vyskocil) is thrilled. He will finally meet the mysterious and fascinating Edita about whom he has learned so much from Vik.
| Actor | Role |
|---|---|
 Eduard CupákViktor Panc | Viktor Panc |
 Ivan VyskočilBretislav Laboutka | Bretislav Laboutka |
 Jana BrejchováEdita Beningerová | Edita Beningerová |
 Zlata AdamovskáNada | Nada |
| ZZdeněk Blažekprevozník Gauss | prevozník Gauss |
 Naďa KonvalinkováMiluska | Miluska |
 Soběslav Sejkreditel Bartík | reditel Bartík |
 Alois ŠvehlíkLíbal | Líbal |
 Karel HeřmánekUdo Vízner | Udo Vízner |
 Vítězslav JandákLádin | Ládin |
 Bohuslav ČápNot listed | Not listed |
 Jana AndresíkováDelnice | Delnice |
 Lenka TermerováTehotná delnice | Tehotná delnice |
| LLudmila VostrčilováNot listed | Not listed |
| JJana RobenkováNot listed | Not listed |
| JJaroslav RadimeckýNot listed | Not listed |
| JJosef StřechaNot listed | Not listed |
 Jiří LírNot listed | Not listed |
| JJan KotvaNot listed | Not listed |
| KKarel HovorkaNot listed | Not listed |
| JJiří NebeskýNot listed | Not listed |
 Karel HáblNot listed | Not listed |
| KKarel EngelNot listed | Not listed |
 Jan KanyzaLádin (voice) | Ládin (voice) |