Heretics of Dune

With more than ten million copies sold, Frank Herbert's magnificent Dune books stand among the major achievements of the human imagination. In this, the fifth and most spectacular Dune book of all, the planet Arrakis--now called Rakis--is becoming desert again. The Lost Ones are returning home from the far reaches of space. The great sandworms are dying. And the children of Dune's children awaken from empire as from a dream, wielding the new power of a heresy called love...

Synopsis from Open Library.