Can you ever truly know what happens in the wilderness? Hilja and Albert are staying in a remote lakeside cabin in the Finnish countryside to try and put the spark back into their failing marriage. It's not going to be easy since Hilja suspects Albert of cheating and he isn't happy with her spending so many night's outs with her friends. Their interest is drawn to the couple in the cabin across the lake seem so much happier and stable than they do. That is until they witness the other couple having an argument which turns violent. They try to find the cabin to help, but no matter how hard they try, they cannot find the cabin. Things become even stranger when Albert wakes up the next morning to find his wife missing. Something is trying to claim the couple, and it won't let them leave the lake until it's done.