This was a classic Hitchcock style story that plays with the audiences' trust, perceptions, and senses. The camera works to disorient and adds to character development. The sickly color palette and florescent lighting is unsettling and makes you feel as uncomfortable as the characters trapped in the various environments. If you enjoy cerebral independent understated films by auteurs, you'll love this. If you want jump scare filled cliche popcorn mainstream movies dumbed down for the masses, you won't understand why this film is so impressive.