The Undeclared War

Saara wins an internship at GCHQ, but when the UK's power goes down, she finds herself on the frontier of high stakes cyber warfare.

Saara finds a suspicious line of encrypted text within the virus's code and unravels a dubious invitation. Is she getting closer to the truth or falling into a trap?

Saara's classmate Vadim returns to St Petersburg. He reluctantly takes a covert job and soon becomes the victim of his own success as his allegiances are put to the test, leading him to a risky stunt.

With Danny unconvinced by Saara's exchange with a whistleblower, she's in a difficult position, but a revelation from Kathy forces Saara's hand. Meanwhile, Marina takes up a new opportunity in London.

The UK general election result prompts unrest, while Saara makes a devastating discovery.

Saara and Vadim join forces to uncover the hidden code and try to prevent a war.