Covers some very complex history quite clearly. There are some annoyingly retrograde "she was limited by the faults of her sex, as all women are" moments at the very end.
Also, if you like Game of Thrones... Cersei Lannister is a dead ringer for Catherine de Medici.
She fought hard, hard, to get political power for all of her children. Her efforts were often counter-productive but not for lack of trying. All sorts of political intrigue are detailed in this book, and Catherine de Medici often ended up on multiple sides. She generally was trying to prevent religious wars and violence that were key parts of this time in Western European history.