Like the other reviewer, I found this very boring and predictable. I usually like Scandinavian horrors, but this had little really going for it. There was barely any atmosphere. Apart from 10 minutes at the start, it was all set at night and there were no real settings other than various dark roads and a fairly normal-looking house. The characters were all fairly uninspired (though decently acted) and there wasn't really any scares or horror. It was all very clichéd, safe and predictable. I can't think for the life of me why it's got an "18" (I've seen more disturbing things in Dr Who!)
If you're bored and have run out of things to watch, by all means, it isn't awful, but you will probably wish you hadn't bothered.