Legends of Dune3 books in series
Dune: The Butlerian Jihad Publisher's Summary
We learn of the betrayal that made mortal enemies of House Atreides and House Harkonnen. Herein are the foundations of the Bene Gesserit Sisterhood, the Suk Doctors, the Order of Mentats, and the mysteriously altered Navigators of the Spacing Guild. Here is the amazing tale of the Zensunni Wanderers and here, too, is the planet of Arrakis, where traders have discovered the remarkable properties of the spice melange...
To emerge victorious over their brutal adversaries in the Jihad, the human race and its leaders have only the weapons of imagination, compassion, and the capacity for love. It will have to be enough.