I guess this is a small, Danish, film with some familiar actors. However the film is based on a novel, the story is rather thin. Some old folks try to summon a spirit, but let in the wrong one. That bad spirit raises hell in a small town. A bit secondary to this story are the personal problems of main character Maria.
The atmosphere is not too bad, but “Kat” is a standard horror with gruely images and shock-effects. The acting is not too bad and the music well chosen, so I find the 3.6 on IMDb slightly too low, but I am not going to rate it much higher coming to a…