I originally read The White Queen when it first came out, but I decided to re-read it after Lady of the Rivers so that I could read all three books in chronological order.
The White Queen is about Elizabeth Woodville, the daughter of Jacquetta from The Lady of the Rivers. There is a slight magic carry-over, but nothing too crazy. Elizabeth Woodville is another lesser-known historical figure, but still an important part of the Cousins' War (Elizabeth married Edward IV and is the mother of the princes in the tower, to which Philippa offers an interesting theory). The White Queen tells the tale of Edward's struggles for the throne, Elizabeth's fight to marry the king as a commoner, and their romance.
I think this is a great novel and ya'll should read!