"Tajny sledstviya" is a Russian detective series based on the novels by writer and prosecutor Elena Topilskaya. The story revolves around Maria Shvetsova, a lawyer and investigator from the prosecutor's office in St. Petersburg. She is young, beautiful, and intelligent, and her exceptional abilities help her successfully solve even the most complex cases. However, balancing such a dangerous job with her personal life proves to be challenging. Besides catching serial killers, Maria also has a beloved man and children who require constant attention.