Violet (Alexis Bledel) and Daisy (Saoirse Ronan) are a pair of gum-cracking teenage assassins who casually snuff out crime figures in New York City, distracted only by the fact that a concert by their favorite pop idol Barbie Sunday has suddenly been canceled. Determined to raise cash for some Barbie Sunday dresses, the duo takes on a new hit job, only to discover a kind of reckoning in the form of sad-sack shut-in (James Gandolfini) who is dying alone of terminal cancer. He persuades the duo to kill him out of mercy, prompting an odyssey of self-examination that catapults the junior enforcers into a world beyond Barbie Sunday and bullets for pay.