Why does Alia alone among the Atreides succumb to Abomination?

How is Javid vital to the plot? Do you expect any more of him than Herbert delivers?

How is Sabiha vital to the plot? Is it reasonable to have her tempt Leto at this point?

Why do the Bene Gesserit fear the prospect of sisters not allowing themselves to age?

What is Leto's most important realization?

Should order trump justice when they conflict?

How does Duncan Idaho's identity as a ghola affect the novel?