No pun intended - and I totally get if this is not your cup of tea. Even if you think this is the worst thriller out there (which I think is wrong - or I would rather tell you that lucky for you, you have not watched a lot of movies). This is a decent effort into ritual killings and a lot of mayhem.
Police is not always up to the task at hand, when it comes to solve mass murder things. You have to dig the movie, the pace it takes and the violence it showcases (as in helping to move the story along - though I have seen way better ways of that being handled) ... not the greatest then, but far from the worst ... if you like crime thrillers, you may give this a try.