The Nanny Diaries

A young, poor, recently graduated anthropologist accidently gets herself hired as a nanny to a very rich family. She takes the job, seeing it as an opportunity to gain valuable 'field work' experience, studying what to her is essentially an alien culture, close up. She is rather horrified by the behaviour of her employers, as their marriage is in trouble and they're neglecting their little boy. She starts to have an affair with the hunk upstairs, but has to hide this in case it affects her job. As the lies pile up, things are forced to come to a head.