I have been editing English professional reports for last 20 years. I picked up the nuances of English using this book 25 years back and bought it now for my son. Content is fantastic and crusply edited - this book has the ability to hone your English as an art in shortest possible time. Caters to all capabilities - the author guides you gently and makes you comfortable with the origins of words, alternate usage and much more. A true work of a language guru.