Samantha "Sam" works at a crisis hot-line where she listens to strangers and helps them deal with their pain. It`s a pain she knows well since the hot-line saved her life once when she lost her sight and didn`t know how to live in a world of darkness. On her last night on the job, Sam receives an terrifying visit from one of her regular callers who feels betrayed that she`s leaving him. This man is no ordinary caller. He`s a sadistic serial killer she`s unknowingly been keeping from killing himself for over a year. With only a skeleton on the graveyard shift, there`s very little that stands between him and Sam. He`s come for her and won`t let anything or anyone stand in his way. Will Sam survive the longest, darkest night of her life?