In 1933 France, Christine (Richardson) is the maid of a well-to-do middle-aged widow (Julie Walters) and her teenage daughter (Sophie Thursfield). Her younger sister, Lea (May) is hired on the recommendation of Christine. The two sisters become increasingly alienated from their employer, separated by barriers between the social class. With only each other to turn to and Christine experiencing much jealousy as to her sister's interest in anyone else, the relationship becomes sexual, adding to the tension between the sisters and their employer. The tension ultimately leads to paranoia, repressed rage and murder.