The film is based on a true incident in Le Mans, France in 1933 called the Papin murder case, where two sisters brutally murdered their employer and her daughter. The murder shocked the country, and there was much speculation about the sisters, including allegations that they were having an incestouslesbian affair.
Plot
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 classes. The employer and her daughter look down on the sisters for the most trivial things, and it soon becomes the norm for the two pairs of women to not even speak directly to each other.
With only each other to turn to, the sisters' relationship becomes sexual, adding to the tension between the sisters and their employer. Both of them deal with trauma brought on by strained relationships with their mother and others of the church. Over time, there are continual rumors of the employer’s daughter getting married and moving out. Christine becomes paranoid and jealous that Lea will go with her when that day comes, and she’ll be left with nothing and no one, but Lea assures her this isn’t the case. Christine fears she is a monster like her mother.
One day, the iron blows a fuse and burns the daughter’s blouse Lea was preparing. Short on money and time, the sisters resign themselves to their fate; when their employer and her daughter return from a shopping trip, Christine tries to explain what happened. The widow claims she knows about the incestuous relationship between the sisters and they’ll never work again once word gets out. The sisters fly into a rage and brutally murder the widow and her daughter. The movie ends on a crime report detailing the state of the corpses as someone knocks on the mansion door. The sisters cling to each other desperately as audio plays of an investigator questioning them about the murder, followed by Christine screaming for Lea.
