The Bene Gesserit find themselves the target of the Honored Matres, whose conquest of the Old Empire is almost complete. The Matres are seeking to assimilate the technology and superhuman skills of the Bene Gesserit, and exterminate the Sisterhood itself. Now in command of the Bene Gesserit, Mother Superior Darwi Odrade continues to develop her drastic, secret plan to overcome the Honored Matres. The Bene Gesserit are also terraforming the planet Chapterhouse to accommodate the all-important sandworms, whose native planet Dune had been destroyed by the Matres.
