Alissa Turney, 17, goes to lunch with her step-father. They argue. The step-father leaves to pick up his other daughter. Alissa is never seen again. Did she run away? Is foul play involved? Joining Nancy Grace today to dissect the facts: New York Attorney Jason Oshins, Psychiatrist Caryn Stark, Forensics investigator Sheryl McCollum, Alissa's sister Sarah Turney, family friend Brooke Freundschuh, former detective Steven Lampley and reporter Levi Page.