Eva Renzi is a young chief commissioner who has just moved to the police headquarters in Turin, the city where she was born and lived until her graduation, from the Unit for the Analysis of Violent Crime in Rome. Anita Sciortino is her new boss, the deputy commissioner added, and directs the Homicide Section, where Eva is inserted. Sullo was based on a serial killer who followed Eva to give her Roman experience. A "show" with an unknown identity, to whose existence only Eva sows believes.