Chapter house dune. Frank Herbert. 1986.

After the events described in Heretics of Dune, the old-established galactic order is in disarray. The ruthless Honoured Matres are conquering all; the planet Dune has been destroyed; only pockets of resistance remain, with opposition coming mainly from the Bene Gesserit sisterhood, co-ordinated from their still-undiscovered home world, Chapter House.

Now, on Chapter House, a new Scattering is being planned, with Bene Gesserit women fleeing to all parts of the galaxy to guard against possible extinction at the hands of the Honoured Matres. And they still hold one asset which has not fallen into enemy hands: they have sand worms, the offspring of one giant worm that was rescued from Dune before its destruction. A desert was prepared for it on Chapter House, and it’s myriad tiny descendants are hard at work implementing the early stages of the cycle which will eventually turn the planet into another barren wasteland.