After 10-year-old Holly Piirainen disappeared in 1993, Molly Bish, a girl the same age from a nearby town, wrote Holly's parents a heartfelt letter. Seven years later, Bish went missing too. Eventually, both girls' bodies were found just 10 miles apart. With two other similar cases in Connecticut and Massachusetts, Phelps' mission is personal to find answers to these crimes that occurred in his local community.