This is not mainstream cinema it is intense cult. A slightly weird plot of manipulation and counter (possibly subconscious) manipulation. The acting is absolutely first class, Winslet and Keitel play very difficult roles of intensely hating and loving opponents. The character of Ruth's mother is brilliant; she has a stress it must be difficult to imitate, but it comes over so well you will reach for your inhaler.
The complexity of the interaction between Ruth and her adversary could not have been attempted by any lesser actors.
I found this film somehow unconvincing, and I was of a generation that this was a common trip from Australia for those seeking enlightenment. The mannered acting was mainly the problem for me. But... I didn't get to the end .