A mysterious new pirate with terrifying abilities—known as the Mule—catches the attention of the Foundation and Empire.

Gaal and Hari advance their plans on Ignis. Empire grapples with an unforeseen prediction. Pritcher enlists help to investigate the Mule.

An unexpected alliance is formed. Pritcher, Bayta, and Toran come face-to-face with the Mule. Demerzel seeks spiritual guidance.