Brilliant.  Psycopaths imitating human emotions to manipulate other people to gain power. The eerie desolate feel of the dark just clicks perfectly in this film. An unknown mask murderer suddenly goes into a killing spree then vanishes into the face of the earth without a trace of hope. Both detectives and serial killers thought they were trying to hide from reality, but instead, they were just trying to reshape it, to reframe their focus.