daughter. >> and theresa, the best friend was obsessed as everyone else in trying to find out what had happened to cindy zarzycki. >> we'd look and hang up posters, we did that for a long time. we never forgot her. >> but what did you really think? >> i knew she was dead the whole time. coming up, just when it seemed she'd never be found, a new detective takes the case. and takes it personally. >> as i got to know him better, he wasn't going to work on the case, he was going to find cindy. >> what would he find? when "disappearance at the dairy queen" continues.