Emissary. Book Two of The Percheron Saga

Without Lazar's guiding hand and presence, the Stone Palace of Percheron has become a different place. Young Zar Boaz, mistrusting of his mother, Herezah, but too inexperienced to stand on his own, seeks counsel from the suddenly changed and secretive Vizier, who has a sinister agenda of his own. As Herezah privately grieves for Lazar, she hatches an audacious plot to destroy the odalisque Ana, who flouts the rules of the harem but has found a measure of protection in having caught the eye of Zar Boaz.
And Ana shoulders a tremendous burden of guilt as she matures from a beautiful girl into a stunning young woman .