Walk through illusions of terror

Some scary shit is happening in a small American town. People are disappearing. A psychologist married to a cop is having an affair and their son is fucken mad angry. All kinds of weird - prob'ly paranormal - stuff is popping out 'round every corner. Or is it just a psycho maniac who makes everyone frightened beyond belief? Got to say, pretty creepy thriller of people questioning their sanity and the multilayered twists in the story were crafted nicely.