"How did Irulan first gain and then arouse the displeasure of Ghanima? Who was Jehanne Butler and why does the Butlerian Jihad carry her name? What are the hidden origins of the Spacing Guild? Where did spice-trance navigational technique develop? What was Leto II's private opinion of Holy Sister Quintinius Violet Chenoeh? Does Cheops have something in common with the three-body problem?