Kiersten White
2) And I darken
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In this first book in a trilogy a girl child is born to Vlad Dracula, in Transylvania, in 1435--at first rejected by her father and always ignored by her mother, she will grow up to be Lada Dragwlya, a vicious and brutal princess, destined to rule and destroy her enemies.
4) Now I rise
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Lada Dracul seeks her younger brother Radu's help in securing the Wallachian throne, but their father, Sultan Mehmed, has sent him to sabotage Constantinople.