What a read - events in the story are shocking, even repulsive yet the words it uses to describe them are so beautiful. Sympathy rebounds from one sister to the other. Who is the victim and who the aggressor? I changed my mind frequently. Claustrophobia and isolation in lives and landscape create a dreamlike quality which lurches into nightmare. I can't say I exactly enjoyed it but it pulled me back in each time I took a break. Powerful stuff.