For seven years, between Emilia and the Marche, a criminal gang made up of policemen spread terror, with over 100 robberies and more than 20 deaths. Many years after the arrests, the questions that story raises are still open. And, as Carlo Lucarelli hopes in the preface, there is a need to talk about Uno bianca. Carmelo Pecora - former inspector of the State Police in Forlì, direct witness of the events - recounts the years of violence and fear "from the inside" and retraces the main stages of the investigation.