As questions are asked about Sutherland's knowledge of his daughter's involvement in her friend's passing, 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.
As widespread power outages cause chaos and threaten lives across the country, the COBRA committee comprised of the UK's leading experts and politicians, gathers to find a way to turn the lights back on.