Book excerpt: As editor in chief of Glossy magazine, Imogen Tate is queen of the fashion world … until Eve, her conniving twenty-something former assistant, returns from business school with plans to knock Imogen off her pedestal, take over her job, and re-launch Glossy as an app. Suddenly, the Louboutin is on the other foot; Imogen may have Alexander Wang and Diane von Furstenberg on speed dial, but she doesn’t know Facebook from Foursquare and once got her phone stuck in Japanese for three days. But Imogen will do anything to reclaim her kingdom—even if it means channeling her inner millennial and going head to head with a social-media monster.