Psychopathic Villanelle—a young and prolific assassin—leaves a trail of high-profile murders across several countries. MI5 officer Eve Polastri connects a new assassination in Vienna to a series of such killings which she has been researching in her own time.
Villanelle is elevated to Keeper by Hélène, a specialist of the Twelve, and requested to kill a Romanian lawmaker. Baffled and disappointed that the work is the same, she moves toward Konstantin and requests to join his arrangement to flee.
Following her assignment in Bulgaria, Villanelle’s handler Konstantin is concerned about her increasing recklessness. He informs her that a covert MI6 task force, led by Eve, is investigating her string of assassinations