Upstairs, madam is planning the party of the season: All eyes are on the grandest house in Mayfair as the countdown to their lavish summer ball begins. Everything must be perfect. But with the chandeliers gleaming and the cellars stocked, loyal housekeeper Mrs King is suddenly dismissed.

Downstairs, the servant are plotting the heist of the century: As the clock strikes twelve on the night of the ball, Mrs King will return to strip the house of its riches - right under the nose of her former employer. And she knows just who to recruit to pull off the impossible: a bold alliance of women with nothing left to lose and every reason for revenge.