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Episode 1

Episode number: 1

Overview: A young intern's first day at GCHQ coincides with a major cyberattack on the UK. To win her superiors' trust, she breaks ranks to analyse the malware code without permission and uncovers a greater threat missed by others.

Episode 2

Episode number: 2

Overview: Saara befriends John, a veteran GCHQ staffer, and seeks help from Gabriel in decrypting a message in the virus. Danny signs off on Saara attending a cyber conference with US agent Kathy, aware that Russian intelligence will also be there.

Episode 3

Episode number: 3

Overview: Vadim returns to Russia where his allegiances are tested, leading him to a risky stunt.

Episode 4

Episode number: 4

Overview: With Saara in a difficult position, a revelation forces her hand. Marina moves to London.

Episode 5

Episode number: 5

Overview: Signs of irregularity in the UK general election result prompt political unrest, and the nation's relationship with its allies is threatened. Saara makes a devastating discovery.

Episode 6

Episode number: 6

Overview: As the true extent of Russia's interference with the UK becomes clear, Saara and her former classmate join forces. Can they uncover the hidden code and prevent a war?