What fascinated me personally, as a lover of history in general and the history of World War II in particular, to Fatherland's how Harris is recording a dystopia. How could Europe can look like if the Nazis would have been victorious. In my opinion, Harris describes this very impressive as it could have been. Detailed and (as far as I see it) historically properly. You can tell the man has dealt with the idea, not only to write this book, but in their own interest.
For all fans of Alternate History is an absolute must. Mixed with historical explosiveness looking for all the easy entertaining discussions, are also in good hands with Fatherland.