In January of 2008, 19-year-old Brianna Denison goes to sleep on a friend's couch. The next morning, she's gone. A bloody pillow found at the scene suggests the beautiful college sophomore has been abducted, but no ransom note ever comes. When a week long search finally finds her strangled body in an open field, police must determine if she's been killed by an ex-boyfriend or complete stranger. Until the mystery is solved, investigators must consider every citizen a suspect. After months of interviews and separating fact from rumour, detectives use forensic science and persistent police work to zero in on a cold-blooded killer.