Protestors hack into Emergency Communications System and broadcast a video of dead inmates at a government prison. MI5 publicly deny the footage is real, prompting the terrorists to set off a series of false alerts. Jez realises he's partly responsible for the chaos but does he have the power to stop the extremists before it is too late? Charlie discovers MI5 corruption directly relating to the London bombing.

In the wake of the nuclear attack on London, demand is high for radiation sickness medication and the thriving black market is awash with predominantly counterfeit pills, as the series allowing viewers to see the future of Spooks and get even closer to the world of conspiracy and espionage continues.

Jez and Kylie are undercover on the notorious Prospect Towers estate, the suspected base for a criminal gang led by the elusive “Zero”, thought to be distributing fake drugs.

Jez and Kylie manage to gain the trust of the estate’s residents via Dylan, an old friend of Jez’s. But, once inside, they find a wall of silence protecting Zero. Most of the residents are happy with him running the estate – he supplies them with the radiation sickness drugs which they are convinced they need.

Back at HQ, Rob is struggling to avoid a ghost from his past when the police question him about the death of fellow medical student Julian Nelson at the time of the London bomb. Nelson’s girlfriend, Emma, has also tracked him down and she, too, wants answers. Meanwhile, Rachel and Charlie’s relationship goes from strength to strength as they work together to uncover the identity of the traitor within MI5.

Jez finally manages to set up a meeting with Zero, posing as a drug dealer. But his position of trust is compromised when Zero catches Kylie in his radiation drugs lab. He imprisons Jez, Kylie and Dylan and demands to know the truth. Jez admits to Dylan that they’re undercover and assures him that his team will find a way to get them out. However, knowing the way Zero works, Dylan isn’t quite so sure.

Jez is played by Heshima Thompson, Kylie by Georgia Moffett, Zero by Johann Myers, Dylan by Jody Latham, Rob by Andrew Knott, Rachel by Ruta Gedmintas and Charlie by Liam Boyle.

When two MI5 informants in Witness Protection are brutally murdered, it's down to Charlie and Field Office 19 to find out why. Most importantly, Charlie and the team need to find out how the perpetrator was able to trace his victims' new identities.

An investigation by Vik (Christopher Simpson) and Jez (Heshima Thompson) reveals that a loophole in the newly enforced ID cards scheme means a person can be tracked down by the Missing Persons Scheme if they have access to their biometric data. When the team finds that the victims' dental records were stolen, it is clear that this is how they were traced.

Meanwhile, Rachel (Ruta Gedmintas) and Charlie are secretly trying to identify "The Ghost Man", hoping that he can lead them to the traitor within MI5. Rachel goes undercover and, with the help of an old police contact, discovers that "The Ghost Man" is ex-people trafficker Luke Blackwell (Warren Brown). Blackwell knows a lot more than he should but will Rachel be able to get all the information she needs before someone else gets to him?

The drama series, set in 2013 and tracing the future of Spooks, continues. During a surveillance operation upon visiting Korean businessman Lim Kwang Ho, Rob (Andrew Knott) and Kylie (Georgia Moffett), get caught up in a terrorist heist on a city bank.

Alice, the daughter of the chief executive of Union Star bank, has been sent inside wearing a suicide bomb which the terrorists threaten to detonate unless Lim confesses publicly to a secret deal they believe he has with the British Government.

The team quickly ascertains that Leo Whitelaw and his eco-terrorist group, Radius, are behind the heist. Whitelaw has discovered a secret Government deal with Lim to bury Korean nuclear waste on British soil. Charlie (Liam Boyle) believes the heist has to be an inside job and CCTV footage from inside the bank shows that Alice may not be the victim she first seems.

With the memorial for the London attack just two days away and knowledge of a second bomb, Charlie convinces the team to break Abid Malik out of prison, as the drama allowing viewers to see the future of Spooks and get even closer to the world of conspiracy and espionage concludes.

Charlie thinks Malik might be the only person who can lead them to the MI5 traitor and, hopefully, prevent another catastrophic explosion. He convinces Yates they’re conducting regular surveillance on Camp Windsmere and sends Vik in undercover as an inmate.

Vik and Malik must both get to the medical room if Rob, posing as an emergency doctor, is going to get them out. Vik attacks Malik, breaking his ankle, and then fakes a seizure himself. As the team set off the prison alarms, Rob, Vik and Malik are able to escape unnoticed.