I tried this on a whim. It is not what I usually read. Not my usual cup of tea if you will. I love history, I love books. It seemed like a good compromise.
I was SO bored. I didn't feel any attachment to the two real life people in the books, didn't care about their friendship and was not moved at all to find out what happened to them. Nothing new is historically revealed through this book, and while it does offer a fresh perspective on the relationships I found it hard to pay attention to the book long enough to finish.
Having said that, I will be the first to admit that I have almost never found a non fiction book that I love. I just don't find them as interesting as escaping into a world different from my own.
If you read historical non fiction and enjoy it you may be far more capable of reviewing this book than I.