I thought this was a great film, very realistic portrayal of emotions involved and was really gripping. Unfortunately the film lost it towards the end. We discussed that it should be ending soon about an hour before it actually did and it got a bit silly with lots of different twists and turns but leaving too many loose ends in between. I would recommend watching it but be prepared it goes on a bit too long.
Also I would just be wary with the rating. After watching we were very surprised with the rating given that there are quite explicit torture scenes which I found disturbing as an adult.