A brutal and painful movie to watch. It makes you think... what would you have done? Would you easily hand this psychopath to the police? It's not like other revenge-movies, where the protagonist tries to do the right thing and his goal being to just kill the antagonist - he wants him to suffer, to feel the pain and angst the victims must have borne.
Outstanding actors.

I gave Rewatch Value "only" 7 points not because this isn't a great movie, but you definitely need some time to process this heavy topic.