Simon and Sierra Brown are the oldest of the Brown children. Simon, who was only older by two minutes, led his siblings through all his schemes. But Sierra was far worse then her twin. She never knew when it was to far. Even Simon stopped eventually. But when Simon and Sierra worked together, the turned into little monsters. Nanny McPhee, who is know to making the most ill behaved children listen, meets the twins. She seems to know all their tricks and know what their doing before they do it. Simon and Sierra thought that they would get rid of this Nanny as easy as the rest. What will the twins do when Nanny McPhee seems to know all their tricks? What will they do when father is going to marry a new horrid woman? And what will happen when there Aunt comes and takes away one of the girls? And when a the nanny's son come Sierra seems takes a liking towards and Simon seems to hate him? - - - - I only own Sierra Brown and Felix McPhee