The movie itself has a personality disorder...

Rating: 5/10 (21 January 2017)

The movie is really two separate movies thrown together, with the first half being the traditional slasher film and the second being the riveting MNS thriller.
First 1/2- There are so many instances where you are screaming at the abducted girls to be more intelligent with their getaway. You will find yourself screaming.... A. "Why have you not noticed the man sitting in the driver's seat of your family car is not apart of your family?" B. "Why do you react to slowly and calmly when you realize the previously stated even is taking place?" C. "Why does it take you almost a full minute to pick up your chair and hit the psycho in the head with it?" D. "Why do you hit him in the shoulder with the chair when common sense tells you to hit him square in the head?" etc.
Also, there is this strange sexual nature that is mentioned about the killer that never gets fully discussed. The quasi rape scene at the beginning leads to the Dr. saying the killer has a thing for women dancing naked, but this is never really needed in the story. This psycho-sexual fantasy he has is never revealed to be his original traumatic event, his motive to his actions, or even mentioned after the first half of the movie. Other than being used to scare the pee out of younger women (immoral pun) who fear sexual assault in our overly-sexually western society, this aspect to the killers psyche is irrelevant to the plot of the story.
Second 1/2- This part of the film was great. Finding the uncomfortable line between reality and fantasy, MNS explores the possibility of superhuman capabilities that can be manifested through the mind when pushed to it's extreme limitations. Watching the movie, viewers find themselves wondering (alongside some of the characters) if there will be a supernatural manifestation. Very entertaining!
Final Thought: Skip the first half, and just know that three girls get abducted by a man with DID and the psychologist that sees the abductor is suspicious that the personality she is meeting with is not the identity being portrayed. Pay close attention to the second. It's good.