This book brought me back to 2007, when these four had their initial conversation go viral. It's how I was introduced to Hitchens, Sam Harris, and Daniel Dennett -- I had heard of Dawkins because of having seen his book, The God Delusion, making the rounds.

I listened to the Audiobook, which has the audio recording of the initial conversation along with essays written and narrated by Dawkins, Dennett, and Harris. A nice book made all the better because of that.