This is a fine effort in the horror/thriller genre. Coming out in 1958 and from Norway you wouldn't think so but...it works...trust me.
First off, the acting in the first say...15 minutes or so...is pretty lame. I guess it's due to the "un-hollywood" like skills of the actors but after it dissipates, the rest of the story/film is a mystery until the end.
Basic premise is that 6 friends go to a cabin at a remote lake to meet up with one of their brothers to relax and have a good time. Turns out the lake they go to has a bad history and the rest of the film we learn about it's secrets. We also learn about most of the friends who show up while they sit a debate where the missing brother has gone or if he's dead or not. It's mostly a talky all the way until the end but it really does grab your attention. You may think of a Friday the 13th feel to this but what you won't get is blood and gore. What you do get is an intricate story that hold you to the couch right until the end.
This one is considered one of the top 5 Norwegian films made..and I can see why. If you give this one a chance you'll see why also.