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.