The key relationship is of course Michael and Jane. The early relationship when Jane was 8, seems a little more than just best friends and there is something more than just friends. The key event where Michael left Jane I feel doesn't get as much emphasis as it should have done considering it is such an important scene, as Jane doesn't forget Michael. The moment where they meet when Jane is fully grown, took longer than it needed to and was dragged out, but was a special moment considering it happened in the Astor Court where they had many childhood memories.
The scene where Vivienne is in hospital, is a very sad scene and beautifully written and i'm sure will bring some tears. It was a scene required for us to appreciate Vivienne, who is portrayed as cold and unloving.
Overall, this is a very fun and heart warming read, and you will learn to love the main characters, Jane, Michael and Vivienne and the whole story is fantastic.