I'm not sure what to say about this ... I hesitate to call it a book, it's more of an essay. When I finished it, I felt that I had learned nothing new. It all seemed very obvious and already well known. Sure, it was interesting to read Harris' argument against "white lies". But I'd heard it all before and probably argued it myself.
But it was well organized and well written and short. Worth reading if you're not expecting anything startling.