It probably won’t surprise you to learn that this is a book about macros in Clojure. The title dashes away any hope of keeping that a secret, which is fine. I’m not big on surprises anyway.
Furthermore, this book is about mastering macros. Now, mastery is a pretty audacious goal: some folks say it takes 10,000 hours to master any skill, which is way more time than it’d take you to memorize this book forwards and backwards. There’s always more to learn. But this is a path on the journey to mastery. So pack your things—it’ll be a fun trip!