Brother Dusk reflects on his legacy as he prepares for ascension. The Foundation arrives on Terminus and finds a mysterious object.

Brother Day meets Zephyr Halima—a would-be leader who opposes the Empire. Brother Dusk grows suspicious of Brother Dawn.

On Terminus, Salvor witnesses how powerful the null field has become. Brother Dawn makes a daring choice.

An unexpected ally helps Salvor broker an alliance. A confrontation between the Brothers leads to unthinkable consequences.

Gaal Dornick leaves her life in Synnax behind when the galaxy’s greatest mathematician, Hari Seldon, invites her to Trantor.