honest, really criticized their investigation very thoroughly, and it wasn't just criticism. it presented irrefutable evidence that the police were on the wrong track. >> before the book could even be released, police focused their attention on the authors. mario spezi's villa was raided, his notes confiscated and the journalist placed under arrest, though later released without charges. police surmised spezi knew so much about the killer that he just might be the killer. then preston's phone rang. >> i thought it was a joke. then they said, no, mr. preston, this is not a joke. we are coming to get you. this is obligatory. you tell us where you are. that will save everyone a lot of trouble. >> preston would find himself at the door of the prosecutor's office here in perugia where he thought he would spend a few minutes answering just a few questions. >> i had never understood how brutal, psychologically brutal an interrogation is.