I hope I'm not giving away too much in this review, but what a surprise this book was.
I started reading it thinking what a cow Anna was - having an affair with her brother-in-law, thinking the worst of everyone, working at a school with a headmaster she hates (why doesn't she just get out, I thought). But coping with everything - and she has some big things to cope with - has Anna in turmoil and her eventual breakdown is a riveting read. You just know that she's going to come out the other end a better person for it.