Dreyer’s English: An Utterly Correct Guide to Clarity and Style by Benjamin Dreyer
If you write for a living, as a hobby, as therapy, as a spiritual exercise; if you are a student or a teacher, you will want this book on your shelf. Dreyer is the top-dog editor at Random House.
Grammars naturally have a school-master-scolding tone about them, but this one is washed in enough good humor, humility, and common sense to make it not only a valuable reference to current usage, but an entertaining read as well.
Reader/writers will find confusions clarified, memory blocks exposed, assumptions corrected and confirmed. It’s a funhouse and a playground for those who think about usage and grammar.