Raquel (Saavedra) has been in service to the kind, wealthy Valdes family for 23 years.
The joyless repetition of her job has left her increasingly dependent on painkillers, and resorting to household pranks to antagonise the family's eldest daughter and a procession of new servants in an effort to protect her precarious power within the home.
Director Silva wields the camera like a magnifying glass in this bleakly funny Chilean examination of Latin America's class gap, as experienced from the near-bottom looking up.
It deservedly won the prize for the best foreign film at Sundance, whilst Saavedra walked away with the acting honours for her riveting vanity-free performance.