In 2019, politician Vivienne Rook causes a scandal on live TV and the Lyons family is brought together when their youngest sibling, Rosie, goes into labor; in 2024, Stephen and his wife, Celeste, worry about their socially withdrawn daughter.

Stephen and Celeste try to rebuild their shattered lives; Daniel's world turns upside down when Viktor is forced to flee Kiev; Edith's former life as an activist calls her back into action; Rosie loses her job to fully automated food service.

As events heat up across Europe, Daniel embarks on a quest to bring Viktor home; Rosie sets up her own business with new boyfriend Jonjo; Celeste exposes Stephen's secret life; Viv Rook sets her sights on the ultimate prize: No. 10 Downing St.

A new Britain begins to take shape with Viv Rook as prime minister; Edith tries to investigate mysterious stories about The Disappeared, while Rosie finds her estate fenced off by the privatized police; Stephen takes a job with his old friend Woody.

As Viv Rook's regime tightens its grip, the entire Lyons family fights back; Rosie stands up to the troops surrounding her home; when Bethany reveals the shocking truth about her father, Edith and Celeste form a secret alliance.