Premiärminister Robert Sutherland har fullt upp med allt från politiska intriger till sin dotters examensdag när en annalkande naturkatastrof hotar Storbritanniens elförsörjning. En specialgrupp, COBRA, samlas för att hantera situationen.

Nationen har drabbats av sitt största strömavbrott någonsin och premiärministern och hans team jobbar dygnet runt med krishanteringen. Samtidigt stöter Anna på en person från sitt förflutna.

Det värst drabbade området får besök av premiärministern tillsammans med Anna, Fraser och deras team. Archies utspel hotar att skapa mer problem för alla.

As questions are asked about Sutherland’s knowledge of his daughter’s involvement in her friend’s death, Anna seeks the help of Eleanor in handling the new revelations about Edin. Meanwhile, a new threat rears its head as public sentiment grows more turbulent.

With the nation sliding further and further towards anarchy, Rachel faces difficult questions about Ellie. Meanwhile, Fraser says goodbye to his father and grows closer to Francine. And as the influence of “People’s Justice” grows ever-powerful, Sutherland is forced to consider more extreme measures to retain control of the country.

As anarchy explodes on the streets and the nation is rocked with night upon night of rioting, Fraser and his team reach the endgame in their mission to get the lights switched back on in the Red Zone. Meanwhile, with his personal life imploding, Sutherland is forced to fight for his political life as Archie finally fires his first shots…