I had the chance to read a couple of the external reviews about this movie and they are favorable to the film. The only problem is that in order for the plot to make sense is that the "determined" police officer in charge of the investigation does not seem to be aware that nowadays one have DNA tests to proof certain crimes. And also that you can make a guess about certain things just by tracing the latest cell phones calls of the victim. If you can accept that then maybe the plot could make sense to you.
On the other hand I was never friend of movies in which one has to be a wizard to understand certain scenes. I like direct language. So be aeare.