Dagmar Jonášová

Lucie Rýdlová is found dead at a destroyed car after a night accident. The seat position shows that she cannot have been driving, and the dissection proves that she had died about four hours after the accident. It is for sure that a timely medical assistance could have saved her life. A pretty young tennis player Lucie lived at her grandmother, because her parents had been working abroad. Criminalists found out that the girl was going out with the interpreter Valenta (Eduard Cupák), who was twenty years older than her, divorced and a bit egoistic man.

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.

School supply teacher timid folk art Ales Brabec won first prize at a music festival and will therefore offer to work for the Prague little theater in the basement. Its director Soukup just needs a few songs for the upcoming musical, and so is willing to do everything to Alex to create the right atmosphere for composing.