Following the latest shocking discovery, the team scramble to understand what it means. It's clearly a message, but who is the sender? Meanwhile, Francine's TV attack on Lord Singer is met with delight by Labour leader Chris Edwards. It is also seized upon by online presence Firestorm, to Francine's discomfort.
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.