Ostensively, this is based on three books written by Philippa Gregory; The White Queen, The Red Queen, and The Kingmaker's Daughter.
First, the White Queen/Queen Elizabeth (Rebecca Ferguson) who marries Edward IV (Max Irons) after his overthrow of the old ineffective King Henry VI and the cruel Bad Queen/Margaret of Anjou. Elizabeth had lost her husband defending the old King. Edward won the crown with his brothers Richard (Aneurin Barnard) and George (David Oakes) and cousin Warwick (James Frain). Neither the mother of the three brothers nor Warwick like the new queen claiming she practices witchcraft which she does.
The second is the Red Queen/Lady Margaret Beaufort (Amanda Hale) who is the mother of Henry Tudor. She burns with the conviction that her son will one day be King. She chaffs at all the slights imparted on her son and stays close to court waiting for an opportunity.
The third is Anne Neville (Faye Marsay), the daughter of Warwick and eventual wife to Richard. Her mistrust of Queen Elizabeth would ignite a whole series of internal family struggle after the death King Edward.
This is kind of like a prequel to The Tudors. If you like scheming and backstabbing, this has loads of that. This series likes to go with more the point of view of the women of court. It doesn't have any big battles or big set pieces. That's perfectly fine. There is still plenty of drama to be had. Rebecca Ferguson is quite good at the center stage. It is James Frain who steals much of the scenes. His presence is overwhelming and rises above everybody. He also has a great part. In fact, there are a lot of great performances from everybody. It helps that the Royal soap opera is so rich.
