When I first heard about "Untold Story: A Novel" by Monica Ali I was doubtful it'd be anything more than tabloid writing. It's based on how Diana's life would be now if she hadn't died in the car crash. I was pleasantly surprised how well-written the book was; good plot line but based to some degree on what we've read about Diana and her emotional instability and how her life would still be because of those issues.
A book I thoroughly enjoyed was "Cutting For Stone" by Abraham Verghese. If you have time to read only one book this summer, this is the one! It's a story that covers generations and continents, a story about love, betrayals, compassion and redemption. It's about twins born of an illicit love affair between a nursing nun and a doctor and what the boys' lives become. Kleenex warning, however, for the last pages! It's a beautifully written novel and one you'll not want to put down.