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.

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

The TARDIS is marooned onboard a 17th-century pirate ship whose crew is being attacked by a mysterious and beautiful sea creature. Becalmed and beset by cabin fever, the pirates have…