Emma tries to help her parents understand that, although their beloved new nanny has made a few mistakes, no one can behave perfectly responsibly all the time.

Nine-year-old Emma O'Fallon finds herself in increasing difficulties at home and at school as her determined efforts to break up the growing attachment between Irish nanny Annie and her boyfriend Bo cause chaos on a family camping trip and Emma's relationship with her best friend Luisa seems to be going from bad to worse.