The Foundation faces two threats: the dying Empire's last general, and something Seldon never predicted — the Mule, a mutant who can control emotions and upend the entire Plan. Asimov's greatest twist character threatens everything, and the revelation of the Mule's identity remains one of sci-fi's most famous reveals.
Clean — pure ideas.
Skip if you dislike:
Moods: Twisty Political Surprising Escalating
Tropes: The Mule Psychohistory Broken Empire Strikes Back Mutation
Sci-fi's most famous twist — don't spoil yourself.
More thrilling — the Mule storyline is Asimov at his most gripping.
That's the question the entire book asks.