Harriet M. Welsch is a spy. But when her friends find her secret notebook, the tables are turned on her. Can she win them back and still keep on going with the spy business?

Harritt is a eleven year old, sixth grader who is a writer and a spy. She has a nanny named Golly who is also a role model for her. She keeps a notebook of negative things that she thinks about her classmates. Harriot's main rival Marion and her classmates finds the notebook classmates find her notebook and expose her for it, outcasting her.