Frank Herbert's Children of Dune

As conspiracies to gain political power abound, Paul's power base is eroded from within and his highly ambitious sister, Alia is gaining a political foothold. Born aware of her ancestral memories, Alia is considered an abomination by the Bene Gesserit. The Lady Jessica, her mother returns to Dune (Arrakis) to visit her grandchildren Leto II and Ghanima. When one particular ancestor begins to possess Alia, Lady Jessica has to take refuge. Leto II and Ghanima devise a plan toward salvation.