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.

Demerzel struggles with the paradox of her programming. Pritcher's true loyalties are revealed. Day sets off on a quest for answers.