The Kingmaker's Daughter by Philippa Gregory

Historical Fiction
Court of Edward IV of England
Earl of Warwick, "the kingmaker", manipulates claimants of royal power. He uses his daughters Anne and Isabel for his own ambition. This historical fiction involves intrigue, rivals, enemies, poison, spies, the twists and turns of loyalty, conspiracies, and imprisonment.
This novel shows a historian's deep knowledge and is fascinating !!!!!