The return of the Red Brigade in Italy, after 11 years of silence from this terrorist organization, was a traumatic event for the entire country. Especially for the families of the victims killed: professors D'Antona and Biagi, and subsequently the police superintendent Petri. It was precisely from these deaths that the investigators gained the key for entering, into the heart of the new RB, discovering that which appeared to be invisible and elusive, and deliver a number of significant blows to the renewed terrorist organization. Narrating this story signifies trying to tell another piece of Italian history, without doubt extremely recent and therefore without the necessary detachment of a historian, but extremely deeply rooted in the ups and downs of Italian terrorism which have ancient roots. This miniseries shows this gripping true story with great quality and respect.