For Katie Nicholl, it’s easy to see why Kate Middleton, the new Princess of Wales, was successful in navigating royal life while Duchess of Sussex Meghan Markle struggled. Vanity Fair’s royal correspondent has written a new book titled, "The New Royals: Queen Elizabeth’s Legacy and the Future of the Crown," which explores the lives of those who are now leading the house of Windsor. In it, she details how Kate managed to thrive as a member of the British royal family while Markle ultimately stepped back with her husband, Prince Harry, Duke of Sussex.