In Sandomierz is committed horrible crime. The naked body of the murdered woman, well-loved philanthropist, is planted in a public place. The way in which it was deprived of life, reminiscent of ritual murder. Local law enforcement officers under the command of the recent star of the capital prosecution, Theodore Szacki, they will not only solve the crime, but also face the hysterical public.

Film Boris Lankosz "grain of truth" was based on the second part of the trilogy of crime Zygmunt Miłoszewski of the same name, whose hero is a prosecutor Theodore Szacki.