Navigators of Dune – Brian Herbert y Kevin J. Anderson

The story line tells the origins of the Bene Gesserit Sisterhood and its breeding program, the human-computer Mentats, and the Navigators (the Spacing Guild), as well as a crucial battle for the future of the human race, in which reason faces off against fanaticism. These events have far-reaching consequences that will set the stage for Dune, millennia later.