The Palace Papers: Inside the House of Windsor--the Truth and the Turmoil by Tina Brown. Brown has been a royal reporter for 25 years and previously did a book on Princess Diana, who she knew personally. This book covers the last 20 years of the House of Windsor, focusing on the many struggles and sometime successes of Elizabeth II & Prince Phillip, Charles & Camilla, William & Kate, Harry & Meghan and Andrew. It is witty, critical, and sympathetic. If you want to know how things got to where they are today post-Diana, this is a good read. It goes up to Phillip's death, so it is very current including all the drama around Harry & Meghan leaveing. But it was published just before the Queen's death, so that is not covered, though it is anticipated.