I don't think its worth 5 star. People are just crazy here who are giving 5 star to it. There are so many instances of flawed investigation. Even a rookie investigator can figure out that there is mole inside team. And Climax was the worst.
Don't want to be spoiler but C'mon where was your logic when you are filming your last scenes?
But watchable and a generous 3 star. It will keep you engaged despite its own investigation flaws