It's an interesting film and the tension level is high throughout. The cast are good and it looks nice and atmospheric. You really do feel her isolation and growing unease. I feel there are a few issues with the film. Firstly, we don't get enough to potentially consider that there is another explanation other than she is being watched. The husband also becomes a bit of a caricature towards the end with his at least she has company line. Talking about endings, that for me was the biggest disappointment. I really don't buy into this American need for a happy ending. I felt we were getting something different which while sad was realistic and more memorable...until we are thrown a final twist to make everything all nice and happy. That isn't life and takes away from the reality as well as making it overall a less enjoyable watch.