Most of what I have learned about the holocaust previously has been from a German or Danish perspective. I have read and seen very little from southern regions or directly from Jewish experience. I spent most of this book feeling like I was learning it all fresh for the first time. It is deeply horrifying - the details, dates, near misses, disbelief, apathy, and inaction. 
A critical viewpoint and masterfully presented history, this reads as both narrative and textbook. It flows steadily and easily; though by no means easy content it is easy to lose yourself in it and read extensively… I finished it in 5 days.
If you have any interest in biographies, Jewish history, or understanding the events of the holocaust, then this is a must read.