In Foundation and Empire, a science fiction novel and the fourth book in the Foundation series, the emperor of the Galaxy has deemed the Foundation a threat, and has sent forces to attack it. Though the foundation emerges victorious from their engagement with the Empire, they soon must face another threat: the Mule, a mutant slowly taking over unsuspecting planets. This crisis sparks a search for the Second Foundation, now the only hope for humanity’s future.

Summary of Foundation and Empire by Isaac Asimov

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