The author recently died and I was reminded of this book. I decided to read it in preparation for the oncoming deluge. This essay is short, but as a book, it is very short. It is so short that its Wikipedia summary seems as comprehensive as the book itself.
The author's insights and analysis seemed valuable, but if I were the publisher I would consider a version that included essays by his critics, Mark Twain's On the Decay of the Art of Lying, and perhaps Max Black's The Prevalence of Humbug (referenced by Frankfurt).