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.

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

Day enters uncharted territory. Dawn and Gaal put their plan in motion. Magnifico's worth becomes clear. Demerzel attempts to restore power.

A long-awaited reunion turns unhappy. Day looks for Song. On New Terminus, the Vault opens-and the Mule takes aim.