Ugh.  I bought this book thinking it was non fiction - that's on me I suppose, although I think I learned of it from a Buzzfeed-style list that did not mention it.  So already I was disappointed.  Then it only focuses on 3 of 6 sisters.  Then 2 of them are Nazi's and 1 is totally in love with Hitler and so 2/3 of the book is reading about being in love / BFFs with Hitler himself.  It was uncomfortable to say the least.  In a non-fiction book that's more acceptable but fictionally like... it was a choice.  I wanted to learn about all 6 sisters not 3.  It could have been Decca instead of Diana and the story would have been much improved.  I just do not like fictionalizations of non-fiction books (or non-fiction written like fiction) and so this was not for me and unless you're super comfortable being kind to Hitler it's probably not for you.