Brian Herbert: Prelude to Dune: House Harkonnen [2001] paperback

Duke Leto Atreides is now the skilful and much-loved ruler of Caladan, served by loyal Duncan Idaho. To his court come Gurney Halleck, despised slave of the Harkonnens – and Jessica, the exquisite, perfectly trained concubine chosen by the Reverend Mothers of the Bene Gesserit to be the mother of Leto’s daughter. Meanwhile, on Dune – planet Arrakis – House Harkonnen ruthlessly harvests the precious, mind-enhancing drug called spice. And Baron Vladimir is slowly being consumed by a loathesome disease. Rabban Harkonnen – House Atreides’ most implacable enemy – prepares to take over his uncle’s empire.