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

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

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.

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?