A female assassin is taken into custody in Russia, and Eve and Carolyn head out to Moscow to negotiate access. She could hold the key to the organization that runs Villanelle. Meanwhile, Villanelle is smuggled into the same Russian jail. It's a grim and brutal place, where not even Villanelle is safe.

Tensions are running high as the situation in Moscow escalates, and Eve starts to question who she can trust. Despite the danger, with her sights firmly set on Villanelle, Eve goes rogue. With both women under pressure, the stakes are higher than ever.

Villanelle's mission is proving anything but straightforward, forcing her to take drastic measures. Meanwhile, Eve makes a shocking discovery, which leads her right to Villanelle and an electrifying confrontation from which neither will emerge unscathed.

Eve is reeling from her act of violence against Villanelle and doesn't know whether she is alive or dead. A paranoid and severely injured Villanelle manages to get herself to the hospital for treatment. Carolyn approaches Eve with an intriguing opportunity.

Carolyn introduces Eve to her new team before Eve briefs them on the Villanelle case. Villanelle, needing to lie low while she recovers, finds a good Samaritan to take her in and care for her.

Villanelle dives deep into the dangerous world of her target under the guise of her newfound persona, Billie. Eve may have worrying competition for Villanelle's affections.

Eve's mission is disastrously compromised. Carolyn briefs Eve on her current status as an employee of the British government and leaves Eve's future in her own hands. Villanelle does everything she can in order to get to her ultimate target.

Eve finds a clue to Villanelle's whereabouts in the most unlikely of places, Villanelle and Dasha work together on a kill, and the pressure is getting to Konstantin.

Konstantin makes a break for it, while Eve and Villanelle try to work out what the future may hold for them - together or apart.