It was a mystery that stumped investigators for years; a college student disappears after a night out clubbing; her mother thought she was at a sleepover with friends and it takes an eagle-eyed detective to find the truth buried in a pile of lies.

The initial investigation into the 1981 disappearance of Torrance, Cal., resident and mother-of-two Carol Jeanne Lubahn hits a dead end. Thirty years later, however, the police re-open the case and turn to social media for help.