DISAPPEARED is a gripping series on Investigation Discovery that focuses on missing person cases.  Now in its second season, each hour delves into one story, tracing the time immediately before the individual vanished for critical clues about the disappearance.  Often hidden beneath seemingly everyday behavior and actions are hints about what may have driven someone to voluntarily vanish or evidence that foul play may explain the mystery.  Some investigations unfold rapid fire using state-of-the-art techniques that enable police to uncover the crucial evidence that solves the puzzle.  Others go cold for months, even years, before a bombshell development reveals the explanation.  And still others remain open to this day and continue to be a source of unbearable pain and frustration for friends and family members.