Gaal, Salvor, and Hari arrive on Ignis and meet the source of the strange signal they've been tracking. Dawn and Dusk are suspicious of Day.

Day and Queen Sareth make an announcement. Tellem sows seeds of distrust between Gaal and Hari. Hober Mallow reaches his destination.

Salvor begins to question the Mentalics' motives. Hober Mallow’s proposal to the Spacers meets resistance. Brothers Constant and Poly stand trial.

Enjoiner Rue confides in Dusk about her distrust of Demerzel. Hober Mallow pulls a daring move. Day sets course for Terminus and the Foundation.

Dusk and Enjoiner Rue learn Demerzel's origin and true purpose. Tellem's plans for Gaal take a dark turn. On Terminus, Day confronts Dr. Seldon.