The Red Queen's Daughter

Mary Seymour is the daughter of the great Katherine Parr--the last Queen of Henry VIII. Orphaned at a young age because of her mother's bad marriage to Thomas Seymour, Mary determines early on that love is a sentiment that causes foolishness at best, and death at worst. She is sent to be raised by Lady Strange, a mysterious noblewoman who informs her of her destiny: Mary is to be a white magician who will join Queen Elizabeth's court and ensure her safe reign.
After spending her early years honing her education and learning the arts of the white magician, Mary is indeed invited to join Elizabeth's court as a Lady in Waiting. There she is met with warm welcome from the Queen, but soon realizes that the court is also rife with ambitious men and women who are jockeying for power. The most dangerous of these is Edmund Seymour, Mary's cousin. The moment she meets the dark, mysterious courtesan, Mary is drawn to him despite herself. Edmund is a black magician--the mirror image of Mary's own powers.
When Edmund becomes embroiled in a plot to overthrow the Queen, Mary has to risk everything she believes to fulfill her calling. But playing this dangerous game could cost her more than she ever imagined.