The first part moves at a glacial pace but from the very creepy scene where the daughter hears a voice on the other side of the door the film is very creepy. The enjoyment the killers get out of tormenting a mother and her children is particularly unsettling. I think even if you don't relate to the characters everyone can relate to how terrifying it would be to get attacked in their own home. The second half of the film will definitely have you double checking the locks on your own doors and windows.