coup de main - noun
\ˌkü-də-ˈmaⁿ
Definition of coup de main : an attack that achieves complete surprise.

Watch: 'Killing Eve' Season 4 trailer.

"Do you know the fable about the scorpion and the frog?" Sandra Oh's Eve asks Jodie Comer's Villanelle in a trailer for the fourth and final season of 'Killing Eve' which begins airing at the end of this month.

"They both die, because the scorpion can’t change its nature."

Watch the trailer below...