It's no definitive masterpiece but it's damn close.

Good movie but grossly overrated

Don't listen to the negative reviews

One of the most extraordinary films you will see this year. Take that as you want.

after reading available articles on this story and concluding the movie was pretty much following the same, it was hard to believe the sister becomes a detective at her own expense while the lazy incompetent new Zealand police does nothing even after she delivers them a case on a silver platter full of circumstantial evidence and witnesses. Finally after two yrs one detective wakes up and saves the face of the police and pushes the case forward. Recommended.