In a large mansion outside of Geneva, Sofia, a 28-year-old undocumented Mexican, starts her new job as a maid for Georgette, a 66-year-old retired company owner. Defiant by nature, Sofia tries her best to fit in; however, she becomes increasingly upset with her employer’s degrading manner.
Pushed to her limits, she seeks revenge by mixing poisonous plants into Madame’s breakfast omelette. Georgette gets sick, though only for one day. Things improve for a while, but soon Sofia is forced to retaliate once more. This time she gets busted. Instead of calling the police, Madame requests Sofia to prepare a lethal dose in exchange for a large sum of money.
Sofia is torn. She tentatively accepts the proposal, while secretly planning to run away as soon as the money has been wired into her account. She is on the verge of leaving, when she realizes how close the two have become.
Sofia returns to mix the poison and stays with Madame until she dies. Sofia travels home, a rich and changed woman.