not revolutionary but nicely done
It may not be revolutionary and maybe you've seen some of these plot lines before. Interesting how many posters said that this is a rip off of other movies - Dead End, Dark Waters, etc. Do these people realize that these earlier movies are not great cinema themselves, and that they stole from the melodramas that preceeded them, and they from those that preceeded THEM, etc.
In this movie, we have an attractive female protagonist (always a plus), nice scenery, and beautiful filming. No horrible mutilations, no grotesque monsters, just creepyness. I loved the woods and hills in the distance; the beauty of the female lead; her red parka against the white snow; the tension in the relationship; the unspoken resentments; the atmospheric creepyness. I enjoy movies about people in challenging circumstances with their survival at risk. All this was enough to keep me watching and to award this movie at least 6 stars.
And I did not guess the ending.