Intel from Berlin points to the existence of a mole, prompting Eve to undertake her first surveillance operation. Meanwhile, Villanelle is sent to England to eliminate a member of British Intelligence. Villanelle wonders, could it be Eve? Meanwhile Eve, in emotional turmoil, now knows how high the stakes are.

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.