Cat is an unstable (maybe mental) woman. She has taken care of her father Robert, a genius in maths, but, that is know old and has lost his mind. When he dies, she will have to deal with Hal, his most promising student and with Claire, her sister, that thinks that Cat is mad and wants to take her to a sanatorium. Cat will have to deal with her fears and her traumas (created by living with a mad genius during five years), being in the shaped part of a knife, between genius and madness, will she fall to one of the parts? The acting is surprisingly good, most of the time you can watch to nothing more than first term shots. Paltrow give us one of her best acting and the other ones are able to show us how good actors are. Despite this, the movie has the problem that none of the characters are charismatic. The movie passes by without any interest and it provokes that a good acting is wasted in a unfortunately uninteresting plot. However, it is not the fact that the movie is unbelievable, though. It approaches to mental illness in a very correct and respectful way, but it lacks something catching. Probably the fact that is an adaptation from theatre makes it more difficult to watch to. With these detail about the story, this lack of charisma or somewhat(maybe is too slow, I don't know but I did not get caught by the movie), the movie becomes just, correct; good if you want to see good acting, but boring as a result. It could have been done better, but it is not bad anyway.
