The events of the Russian detective series "Formula of Crime" unfold in 1895 in St. Petersburg. Anastasia Ardashnikova, a young noblewoman, returns to her homeland from France. She has become one of the first female graduates of the Sorbonne Law School and now dreams of investigating real crimes using modern European criminology. However, her fellow countrymen condemn a woman involved in a "man's business." The only one who supports her is the experienced police officer, Taras Smolokurov.