When a Russian politician is murdered, Eve is tasked with protecting the only witness and soon finds herself on a collision course with an assassin.
In the aftermath of her recent assignment, Villanelle is ordered to take a break; never one to do as she's told, she goes ahead with her next mission regardless; Eve is given a dream opportunity to join a secret MI6 unit tracking Villanelle.
When Villanelle kills a Chinese colonel at a kink clinic in Berlin, Eve and Bill travel to investigate; while Eve and Bill chase up a number of promising leads, Villanelle enjoys the cat-and-mouse of their proximity.
Intel from Berlin points to the existence of a mole, prompting Eve to undertake her first surveillance operation; Villanelle is sent to England to eliminate a member of British Intelligence.
Having survived a terrifying close call with Villanelle, Eve now has the mole ensconced in a safe house and is buzzing; they have an exciting opportunity to glean information and crack this thing open.
Eve and Carolyn head out to Moscow to negotiate access to a female assassin that could hold the key to the organization that runs Villanelle; Villanelle is smuggled into the same Russian jail.
Tensions run high as the situation in Moscow escalates; 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 proves anything but straightforward, forcing her to take drastic measures; Eve makes a shocking discovery, which leads her right to Villanelle and an electrifying confrontation from which neither will emerge unscathed.