The first half is incredibly interesting. There is a lot of info that sheds light on the helpers and the hiders struggles. It explores Anne's thoughts and the authoring of the diary, Otto's struggles and decisions around the Anne Frank story, and the helpers postwar life. 

After much of the historical is explored the book tapers off into a weird area around the authors family and while interesting, there wasn't a good delineation to when this was happening much of this familial exploration should have been more epilogue.