Children of Dune

Paul Atreides has been succeeded by his twin children Leto and Ghanima, under the regency of his sister Alia. But all is not well in the Empire; a harsh tyranny has been established under the fanatical direction of the Fremen disciples. On Arrakis itself, much has changed. A slow ecological transformation has brought vast areas of greenery and even stretches of open water. The sand-worms are vanishing and this spells disaster for the planet.  Book 3 of series.