The show revolves around the Deputy Prosecutor Maria Shvetsova and her team who investigate the most difficult crimes in Saint Petersburg.

In the center of the plot is a senior investigator named Mariya Shvetsova and her male colleagues. The plot is the most vital, seasoned with a fair amount of humor - otherwise, how can the audience (and the heroes) endure countless morgues, identifications and other "lovely" delights of the investigative routine?—zoroman2008