This book is about Mary-Anne who decides to put together a baby-sitters club with claudia, and stacy. As they start seventh grade they meet a new girl named Kristy. They all become new friends and they decide to be in the baby-sitters club that Mary-Anne put together. They put posters around the neighbor hood and school. They have a lot of parents calling them and they happy they doing this together.
The rules of this book is helpfulness, friendship and truthfulness. The personality of the main character is sweet, helpfulness and neat freak.