Caroline Taggart, who has made a name for herself expounding on the subjects of grammar, usage and words generally (and who for decades made her living putting in the commas in other people’s work), takes her usual gentle and gently humorous approach to punctuation. She points out what matters and what doesn’t; why using six exclamation marks where one will do is perfectly OK in a text but will lose you marks at school; why hang glider pilots in training really need a hyphen; and how throwing in the odd semicolon will impress your friends. Sometimes opinionated but never dogmatic, she is an ideal guide to the (perceived) minefield that is punctuation.