Hand of Isis (Numinous World, #3)

Against the rising power of Rome, Egypt is the last & strongest bastion of the Eastern Hellenistic kingdoms. Charmian is Cleopatra's half sister, daughter of Pharaoh & a woman of the harem. She shares a great honour & a burden with Cleopatra & their sister Iras - they are fated to defend Egypt from those who would destroy her.