I don’t know what I was looking for with this book, but I didn’t find it. Overall it is informative for those who don’t follow the royals. You also get the the author Christopher Andersen's point of view.
There is lot on how the two princes were raised. Charles is shown to be mostly aloof, but steps in when needed. Diana while loving and involved when present is away a lot. Anderson says Diana confides details of her love to William as women often do with their intimate friends.
You learn how William met Kate and how she waited for him to propose. She tolerated his infidelity and a break up. You see Harry enjoying military service, dating different women and falling in love with Meghan. There is detail on the weddings, the planning, settling in as couples and becoming parents.
One of the author’s themes is that William is very much The Heir and Harry the spare. There is instance after instance of William in the limelight with Harry being ignored. You see Harry getting bad press for things for which “Fleet Street” would give William a pass.
Another theme was that Diana did not suffer in silence. Anderson says that William tried to shield Harry from the shouting and would slip his mother tissues what Charles made her cry. Diana in despair, once threw herself down the palace steps. While Charles was busy with Camilla, Anderson claims Diana was romantically busy too. I don’t follow the family enough the know that (or have heard the gossip that) Charles was skeptical that Harry was his son or that James Hewitt, the alleged father, was not Diana’s only lover.
Anderson shows Diana as a master in manipulating the press. For instance, she arranged photo ops to show herself as a good mother. Charles was not so savvy and looked like a poor parent. When she said there were “three persons in this marriage”, she did not, if you follow Anderson, include the people she added to it.
These brothers have a unique experience growing up as part of the “firm” which makes the parting of ways very sad. I did not detect a bias in how Anderson reported on the steps leading up to "Megxit"
Anderson reports the incident that made Kate, or was it Meghan, cry as being Meghan’s insistence that flower girls in her wedding not wear tights (as dictated by tradition) on a hot day. If this is the level of conflict, it seems that Meghan does not pick her battles very well. In several instances Harry did not keep the Queen, the PoW or his brother informed of his moves - they got them in the news. It seems that Harry has not thought through a winning strategy.
Royal watchers will most likely not find anything new. For those who only catch the headlines, there is a lot here; unfortunately, it is hard to tell what is a hard fact. Checking the sources section (one big narrative for each chapter) is not easy and a lot of the sources are news reports and interviews that may or may not be authoritative.
There is an OK index. There are 16 pages of color photos, many looking like the official photos of weddings, ceremonies and publicity portraits.