The story revolves around a young microbiologist named Lyusya Polikarpova. She had planned to become a graduate student at a university in the capital city, but things didn't work out for her. Lyusya had to return to her hometown. It was not easy for her to find a job in her field, but the persistent girl was eventually hired as an assistant in a factory laboratory where the employees deal with industrial waste. Her new boss, an enviable bachelor, took notice of the ambitious girl.