Nearly 10 years after Princess Diana died in a car crash in France, you might think Scotland Yard would be close to wrapping up its investigation into whether any foul play was involved. Yet the publication this week of a new exposé by Di's butler, Paul Burrell, has grabbed investigators' attention. Burrell's first book on Diana, A Royal Duty, dished plenty of dirt. Now the new book, The Way We Were, contains further info, reveals my colleague Richard J. Newmanlike Burrell's insistence that a splashy ring given to Di by her playboy pal Dodi Al-Fayed was a friendship gesture, not an engagement pledge. Newman says that's relevant because some influential people, like Dodi's billionaire father Mohamed Al-Fayed, think Di may have been murdered to prevent her from marrying a Muslim. Last week, the book's publisher, Harper U.K., let Scotland Yard have an advance read of the book, to look for clues. And Burrell, who stands to make multimillions from The Way We Were, says he has held nothing back from Scotland Yard and will continue to help with the inquiry.