mario spezzi's villa was raided, his notes confiscated and the journalist placed under arrest, thoughrmised spezzi's knew so much about the killer he just might be the killer. then preston's phone rang. >> i thought it was a joke, and 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 pooirz perugia where he thought he'd spend a few minutes answering a few questions. >> i had never understood how brutal -- psychologically brutal an interrogation is. you feel absolutely helpless. >> and the chief interrogator was and is? >> giuliano mignini, this prosecutor, who isn't -- let me tell you something. he knows exactly what he's doing. >> giuliano mignini was the prosecutor for both the monster and the amanda knox cases. just like during amanda's interrogation, preston also says he was asked to imagine scenarios of how the crime could have occurred. >> i was terrified. i thought, these people have th