When Kristy, Claudia, Mary Anne, and Stacey, the members of the Baby-sitters Club, each receive mysterious calls while they are working, they decide to find out who is responsible.

Spending two weeks at the New Jersey shore as mother's helpers, Mary Anne objects when Stacey neglects her babysitting duties after falling in love with Scott the lifeguard.

As a newest member of the Baby-sitters Club, Dawn tries to win the acceptance of the club's president by tackling a tough babysitting job.

Kristy's mom is getting married, and Kristy's a bridesmaid. The only trouble is, fourteen little kids are coming to the wedding, and they all need baby-sitters. Stacey, Claudia, Mary Anne, Dawn, and Kristy think they can handle fourteen kids. But that's before they spend five days changing diapers, stopping fights, solving mix-ups, righting wrongs... and getting sick and tired of baby-sitting. One thing's for sure: this is a hectic way to have a wedding....

Stacey's friends are crushed when they hear that she is moving back to New York City. How will the Baby-sitters Club cope without her?

Feeling isolated as the only African American in her sixth grade class, Jessi gains a sense of belonging by participating in the Baby-sitters Club, learning sign language in order to communicate with a deaf child, and dancing in a ballet.

Dawn's a little jealous when there's a formal ceremony to welcome Jessi and Mallory into the Baby-sitters Club. Don't people know that Dawn's a special baby-sitter too? Then it's Dawn's turn to shine. Mrs. Pike wants Dawn to help prepare Margo and Claire for the Little Miss Stoneybrook contest. So what if Margo's only talent is peeling a banana with her feet? Dawn's going to help her charges win that contest any way she can. The only trouble is...Kristy,...

Mysterious happenings, beginning with a chain letter, have Mary Anne and her friends worried. The Baby-sitters need to solve the mystery soon or their bad luck might never end.

Dawn goes to California to visit her father and brother, and the attraction of that lifestyle may cause her to leave Stoneybrook for good.