I just finished this book no more than an hour ago. Wow. Yeah for the history and for another look at Hitler. But that is not what this is about.  It is about the human heart and how a single mistake can change the world of eirther one man or one country.
This is NOT genre, nor is it a thriller or even a terribly fast read.  It is grand characterization both on the individual level (her detective feels so real I believe he existed) and on the national level. Nicely done.