A murder that Rome has never forgotten, but that nobody seems to have really wanted to solve. It is the crime of Simonetta Cesaroni, 20 years old, murdered on August 7, 1990 in the apartment in via Carlo Poma. A crime scene marked by macroscopic errors: disappeared finds, ignored traces, surface investigations. Guardians, boyfriends and residents passed by suspects in Innocenti, up to the mysterious suicide of Pietro Vanacore. In the background, other murders in the same building and even suggestions of secret dossiers. Today, 35 years later, the Prosecutor tries to re -establish the threads with new genetic comparies and old pieces never stuck. But the question remains: who killed Simonetta? And why does the truth continue to be hidden? Online on IlGiornale the analysis of the investigative journalist Alessandro Politi.