Stacey has just moved to a new town and is trying to adjust to her new life while also handling babysitting work. She meets Kristy, Claudia, and Mary Anne, and together they form the Baby-Sitters Club. They face challenges, meet other babysitters, and learn to work as a team.
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