Arriving back home as a traitor, Carolyn has a limited amount of time to use the information she has to her advantage. Eve tracks Villanelle down and persuades her to pool resources and have one last stab at the Twelve.
Eve's life as a spy is not adding up to what she had hoped it would be when she started. She is a bored, very smart, MI5 security officer who is very desk-bound. Villanelle is a very talented hugger, mercurial in mood, who clings to the luxuries of her job. Eve and Villanelle go head to head in a fierce game of cat and mouse, each woman equally obsessed with the other as Eve is tasked with hunting down the psychopathic assassin.