Inside Buckingham Palace by Andrew Morton

ANDREW MORTON is one of the world's best-known biographers and a leading authority on modern royalty and celebrity. His groundbreaking 1992 biography revealed the secret world of Diana, Princess of Wales. Written with her full, though then secret, cooperation, the book changed the way the world looked at the British royal family, prompting Tina Brown to declare in The Diana Chronicles: The journalist Morton most reminds me of is Bob Woodward.
Diana: Her True Story was a #1 New York Times bestseller; and Andrew Morton has gone on to write bestselling biographies of Monica Lewinsky, Madonna, Tom Cruise, and Angelina Jolie. The winner of numerous awards, including Author of the Year by the British Book Awards, Investigative Reporter of the Year by What the Papers Say, and Scoop of the Year by the London Press Club, Morton lives in London.