What happened to Kelsie Schelling? Twenty-one year old Kelsie mysteriously vanished into thin air in Pueblo, Colorado, over three years ago. The family says surveillance video, text messages and other evidence point to her boyfriend's involvement, yet, to their outrage, police have not yet classified the case as a homicide and have not charged him with a crime. But then a series of Facebook messages to Kelsie's mother raise new theories – is the missing girl's disappearance prompting someone to attempt extortion? "20/20" investigates and confronts those behind the mysterious plot and uncovers developments about what really happened to Kelsie.