The White Princess (The Plantagenet and Tudor Novels #5) by Philippa Gregory

Caught between loyalties, the mother of the Tudors must choose between the red rose and the white.

When Henry Tudor picks up the crown of England from the mud of Bosworth field, he knows he must marry the princess of the enemy house—Elizabeth of York—to unify a country divided by war for nearly two decades.

But his bride is still in love with his slain enemy, Richard III—and her mother and half of England dream of a missing heir, sent into the unknown by the White Queen.