48 Hours: Season 33, Episode 31

33 - 31: The Circleville Letters

Has a forensic document expert unmasked the anonymous author of the infamous Circleville letters? For nearly two decades, an anonymous letter writer terrorized the small town of Circleville, Ohio, by sending threatening letters that exposed alleged secrets about neighbors and friends. Erin Moriarty and 48 HOURS investigate the true crime mystery behind the letters and interview experts about the documents.