Sam Harris is one of author i strongly disagree with. First of all, he dismissed all religion with a broad brush. Second, he has repeatedly attacked Judeo-Christian- Islam tradition specificaly to gain attention.
So imagine my surprise that this book lays out the foundation of his belief that some form of spirituality is useful, especially meditiation. I find his science dubious, but his approach insightful.
If you are interested in being more spiritual as an atheist, this is the book for you. If you are insterested in history of mind-body-dualism, this is also the book for you