I'm almost a little scared to write this review because I'm not sure I'll be using proper grammar! Roy Clark's delightful, small book on grammar is not exactly a "how-to" book, but, rather, a "why" or "when" book. "When" to use ellipses, "full stops" (Brit-lish for "period"), various verb types, etc. And "why" to use them in your writing.
He looks at the sometimes quirky evolution of words and writes quite a bit of history of language.
Clark writes short chapters which end in "keepsakes", summaries of what he's just written. This is not an an official grammar guide - Clark seems to have written one of those - but rather a book whose purpose seems to have the reader stop-and-think when he's writing. Whew. Okay, how did I do?