I bought this book on the strength of Cora Diamond's blurb on the back cover. I was very disappointed. Especially in his discussion of rule following, Brenner does not so much explain the relevant ideas as he paraphrases them. (An example: in his discussion of sections 206-223, Brenner imagines someone asking "suppose different people respond in diffferent ways to the same order. Who is right?" He answers, "if there is an established practice among these people then the right way will mean the customary way." The answer is a direct paraphrase of the text around section 201. But simply paraphrasing or extracting from the text gets us nowhere. If you already understand Wittgenstein, you will understand this remark. If not you won't. Either way, it won't much help.) Brenner's discussion of the private language argument is better. But there's still _much_ better expository material available.