The Dark Side of the Moon

I must say i really enjoyed the first 2/3 of the movie: its atmospheric and the story-line advances fast and the movie really captivates you. But then it all went wrong, that in the end i would not recommend to watch this movie. What happened? For me a story-driven movie like this one needs to have a somewhat plausible end. The story advances to more and more to unrealistic heights, which makes one ask oneself "i am really curious with what "magical trick" at the end everything will make sense". The movie builds up tension and more tension for the end and then the movie more or less just stops. Its like really good sex that builds up more and more and then it just stops without an orgasm: leaving you unsatisfied and frustrated...