why did Harriet want to be a spy

An eleven-year-old girl who is an aspiring writer and avid spy. She follows a "spy route" every day after school and takes detailed notes in a notebook. Harriet is a precocious child and a keen observer. She loves routine and follows her own set of habits and patterns of behavior. When her nanny leaves and her notebook is discovered, Harriet is forced to deal with major challenges to her formerly organized life.