The protagonist of the film is a female microbiologist and inventor of penicillin. The discovery of this life-saving drug was preceded by many years of scientific research, which Dr. Lebedev conducted in his laboratory in a small provincial town at the beginning of the century... Tanya, a girl from the neighborhood, accidentally finds herself in the doctor's house, where she first encounters the mysterious world of science...
as Татьяна Петровна Власенкова
as Глафира Сергеевна Рыбакова
as член медицинского совета
