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With Britain in danger of being struck by a deadly virus, the team must quarantine anybody infected to avoid a disaster. They work out that the virus must have been created by a country with a bio-weapons programme – and therefore a vaccine – and set about quizzing key spies from the suspect nations.

But getting them to talk isn’t easy and involves exposing them to the virus, in the hope they will then reveal details of the vaccine. Russian agent, Edik Kuznetov, reveals that Russia already has the vaccine and the British Government is already negotiating for it – but won’t pay what the Russians are asking.

Kuznetov orders Russian couriers to bring him the vaccine – but they’re still not keen to hand it over to the team. To complicate matters, Adam has now been exposed to the virus, and getting the vaccine becomes a matter of life and death…

VIDEO: Watch a preview of Spooks