An excellent book if you're delving into the power of being an introvert. Cain looks at the topic from many different angles without becoming psycho-babble or sounding like a blogger. The book is meticulously noted with sources cited. As a life-long introvert, it was fun and rewarding to see my personality style validated. As someone who works with youth, it puts "the quiet ones" in a whole new light and suggests that I should rethink how those kids are to interact with the larger group. Recommended for managers and leaders.