When an MI5 officer makes the connection between a series of seemingly unconnected murders, her efforts are noted by the head of the Russia Section of MI6, who tasks her with tracking down the elusive culprit.
As her recklessness earns the ire of her handler, Villanelle is notified of Eve's task force and her mission to bring her down.
Villanelle sets a trap for Eve, who travels to Berlin to investigate the former's latest murder. But the trip has unforeseen consequences that push Eve to the brink.
As Konstantin tries to curb Villanelle's roguish tendencies, she gets assigned a joint case that brings her too close to Eve.
Frank reveals a vast conspiracy engineered by an organization called The Twelve. Konstantin notifies Villanelle of a present threat.
At a Russian prison, Konstantin's connection to the unsuspecting Carolyn is revealed. Villanelle strives to prevent Eve from getting information on her.
As Eve pries into Villanelle's past, Villanelle is tasked to eliminate a familiar face. Eve discovers a hidden secret about Carolyn.
The tables turn as Konstantin enlists Eve's help against Villanelle. Despite being fired from MI6, Eve continues with her efforts to locate Villanelle, leading to an explosive confrontation.