Open Book(1974)

Original title: Открытая книга

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...