september 20th, 1993, six months after tricia's disappearance, now 15-year-old jessica roach goes missinggeorgetown, illinois. investigator gary miller got the call. >> we all knew we had something really bad here. we had an abduction. >> jessica's badly decomposed body was found in an indiana corn field weeks later. then, like tricia's, jessica's case went cold. >> there's a lot of times you wonder if you'll solve it. but you know you're going the keep going and check everything out, you're going to recheck everything. >> for over a year, miller scoured local police reports. and then a break. a vehicle reported in a county nearby. the owner, larry hall. >> he had been involved in stopping some girls. those girls were scared. they ran from him. >> in the last six months, hall's van was spotted by more than 11 girls in five different towns close by, including those where jessica lived and where her body was found. now, miller contacted the police in hall's hometown to arrange for an interview. >> he initially said, no, you know, he hadn't been over here. >> miller had to coax hall to admit