When I started this book I had high hopes and the information about Berlin and the change to Nazism and the often cruelty and attacks on American citizens were very interesting.  Also the interplay of characters, Nazi and not. What I was very disappointed in was the free spirited sex life of Martha, the daughter.  Here was a woman who was married (somewhat) but proceeded to have an active sex life with practically anyone who came along.  She might have been the daughter of the ambassador but she was no lady. IF the author wanted to present the whole story, then reactions and actions of Bill Jr and the ambassador's wife would have added to the story.  Rather the book was more about the daughter and her affairs than the presenting what was really going on in Berlin 

Question: How is the information?
Answer: the information about Berlin and the change to Nazism