This book is worth reading just because of the circumstances of Dr Klemperer's life.
I read this before going on vacation and now it's been too long to write an adequate review. Dr Klemperer sets out to study how the Third Reich used language to achieve its larger purposes. The alteration of language was necessary to their purposes. Changes in language made everyday people susceptible to Hitler's message in ways they were not even aware of.
The arguments of the book are too disjointed to summarize in an intelligible way. See here for an attempt. There's enough serious food for thought in this book that I'll probably read it again and update this post.