Firstly, you think something happened, then you get to know what really has happened, the story doesn't end up there, the story just becomes more interesting at this point and keeps you on your nerves as you still can't predict what will be the outcome, you are just waiting for the end to be revealed, more focused more engaged. And you get to know about a complete psychopath. At last you will wish that you never meet such a psychopath in life or stuck with such a person in real life.