Nadine O'Dell was on her way to babysit her boyfriend's younger siblings when she was last seen walking down a Michigan street on August 16, 1974. Then just 16, Nadine would be 59 now. But her family and investigatolrs have not given up on solving this cold case. Nancy Grace looks at the case with forensics expert Joseph Scott Morgan, private investigator Vincent Hill, Los Angeles psycho analyst Dr. Bethany Marshall, and Crime Stories investigative reporter John Lemley.