Claudia, who has always been very different from her sister, comes to the conclusion that she must be adopted. 

Dawn and Mary Anne are finally stepsisters and also roommates. When they begin to get on each other's nerves, Dawn comes up with a solution which pleases everyone. 

Kristy believes that the autistic child she sits for is normal enough to attend special ed classes at school. After a while though, she realizes that Susan would be better off with children like herself. 

Of all the babysitters, Kristy's the last one anyone would expect to have a secret admirer. But someone is sending her mushy notes with hearts all over them. 

Mary Anne and Stacey are in Sea City working as mother's helpers for the Pike family. When each of the girls meets up with her boyfriend from last summer, things start to get complicated.

For once, Claudia's studied really hard for her math test. And when she gets her paper back, it has an A- on it. All right! But then Claudia's math teacher calls her to his desk and accuses her of copying off of Shawna Riverson's test. Claudia can't believe it, and neither can the baby-sitters. Claudia would never cheat! And they're not going to rest until they help clear Claudia's name!

At long last, Dawn's mother and Mary Anne's father have decided to get married! 

When Jessi's mom goes back to work, Aunt Cecilia moves in with the Ramseys to help out. Jessi is mortified that she has a baby-sitter and can't stand her aunt's bossy ways. 

There's some bad news in the Pike family: Mallory's dad has just lost his job. And since money is going to be tight until Mr. Pike finds a new job, all eight of the Pike kids decide to help out. Nicky gets a paper route, Vanessa tries selling her poetry, and Mallory takes a baby-sitting job in Kristy's ritzy neighborhood. But being around the Delaneys only makes Mallory feel poor. They have a cat that cost $400 and tennis courts in their backyard! Poor Mallory - she needs the Baby-sitters now more than ever!

Dawn has met Travis, an older boy, and she knows he's the perfect boy for her. But the baby-sitters think that smooth-talking Travis is no good and plan to tell Dawn just that.

Stacey's parents are getting a divorce. Stacey is sad and angry, and she has a big decision to make - stay in New York with her father, or move back to Stoneybrook with her mother.

Lately, Mary Anne's been feeling like she and Logan are spending too much time together. They fight over silly things. And Mary Anne never gets to do what she wants to do - like read, and baby-sit, and be with her friends. But when Mary Anne suggests that she and Logan see less of each other, Logan takes it all the wrong way. Could this really be the end for Mary Anne and Logan?

The members of the Baby-Sitters Club come to the rescue to help Mary Anne search for her beloved kitten, Tigger, who has suddenly vanished.

The baby-sitters love getting new clients. So when the Lowells contact the club, everyone is thrilled. For Mary Anne, sitting for the Lowells is a snap, and the kids are adorable and obedient. But when Claudia meets the family, Mrs. Lowell will barely look her in the eye, and the kids are downright rude! The next time Mrs. Lowell calls the BSC, she requests another sitter - anyone but Claudia. Claudia has no idea what she did wrong, but the BSC won't rest until they find out!

Claudia has a sad good-bye to make. Her grandmother, Mimi, has just died. Claudia understands that Mimi was sick for a long time, but she's still mad at her grandmother for leaving her. Who will help Claudia with her homework...and share "special tea" with her?