so here we are, more than 20 years after the end of a killing spree that left 14 young people dead. the murder weapon has never been found. there's no definitive proof of a sardinian connection, let alone of a satanic cult. the guy who tipped spezi about the villa and iron boxes was a con man out to make a few bucks and the endless investigation has now turned into a monster itself eating more of its own. the judge who interrogated doug preston is under investigation for abuse of his office. so is inspector giuttari who told us carlo was in jail when he really wasn't. giutarri is also serving a suspended sentence for making false statements in an unrelated case. and mario spezi, a high court in rome finally cleared him of criminal wrongdoing. he says the book about carlo is the last thing he'll ever write on the monster case. do you believe it? >> i believe. >> do you believe he's the one? >> i can't prove, but i believe. >> does it even matter anymore? pia was just 18 in 1984 when the