Kiersten White

When a rescue goes awry and results in the death of something precious, the devastated Guinevere, impersonated by a changeling witch, returns to Camelot to find the greatest threat yet--the real Guinevere's younger sister.

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.

Minnie and Cora, sisters living in a sleepy Maine town in the nineteenth century, are intrigued by Arthur, a mysterious boy with no past who has come to live in their mother's boarding house--but something sinister is stirring and the teens must uncover the truth, and unlock the key to immortality.

To build the country she wants, Lada, the brutal ruler of Wallachia, must destroy everything that came before, including her relationships with brother Radu and former love Mehmed, Sultan of the Ottoman Empire.