The investigation of the new inspector Gabriele Mancini into a series of rapes of young women who were former drug addicts that took place in the Parco degli Acquedotti takes an unexpected turn when he himself is recognized by one of the victims as the culprit. Contrary to the orders of the magistrate Castelli, inspector Anna Gori continues her operation of infiltration into the Russian mafia environment. The rape accusations leveled against Inspector Mancini by one of the victims of the Parco degli Acquedotti seem to be supported by the discovery that the mother in her youth had been hospitalized in a Swiss clinic for drug addiction. Subjected to a psychiatric evaluation, the inspector will prove to be completely innocent and, rehabilitated in the investigation, will be able to identify the real culprit.