A policeman with a troubled past investigates a series of murders.

Detective Enzo Vitello becomes obsessed with tracking down the serial killer "Dostoyevsky". The killer has a habit of leaving letters next to his victims' bodies in which he describes their last moments. Seduced by the murderer's nihilistic notes, and driven by his own demons, Vitello embarks on a secret correspondence with the killer. This exchange drives Vitello into the darker corners of his soul and forces him to confront a secret from his past - a secret that led him to abandon his daughter Ambra when she was a toddler. Vitello penetrates deep into the murderer's mind, but also opens the doors to his own thoughts and emotions.—X