Visiting her father on the west coast, Dawn is tempted to stay with him when she enjoys the beach, Disneyland, and a wealth of healthy restaurants, but the homesick baby-sitter fears leaving her mother and all of her friends.

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.

Receiving a desperate call from the Mancusi family, Jessi takes on an unusual sitting job caring for three dogs, five cats, two birds, a cage of hamsters, guinea pigs, fish, a snake, rabbits, and turtles.

Mallory discovers that the terrible twins she baby-sits on a regular basis are not really bad - they just want to be treated as individuals.

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.

Mallory and Claudia are helping Stacey unpack from her move back to Stoneybrook when they find an antique trunk in the McGill's attic. Stacey doesn't want the dusty thing, so she gives the trunk to Mallory...who finds an old diary at the bottom of it. The diary belonged to Sophie, a girl who lived in Stacey's house in the 1890s. As Mallory reads deep into Sophie's diary, she discovers a mystery on their hands to solve, because Stacey's house isn't big enough for her, her mom...and a family of ghosts! 

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. 

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

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? 

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. 

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.

Stoneybrook has gone star-crazy! Derek Masters, an eight-year-old regular on a hit TV sitcom, has moved to town. Everyone's wondering what a real-live TV star will be like - will he drive to school in a limo? Jessi can't believe it, but even stars need baby-sitters, and she's the lucky club member to watch Derek Masters. Even though a lot of kids at school call Derek a spoiled brat, Jessi likes him immediately. He rides bikes and eats junk food like a normal kid, but he has exciting stories about Hollywood, too! Maybe Jessi would like to be a star, too!

Claudia's not worried when she hears her newest baby-sitting charge, Betsy, is a great practical joker. After all, how much harm can one girl do? As it turns out - plenty! Claudia breaks her leg because of one of Betsy's mean jokes...and now she's talking about quitting the club. Baby-sitting might be too dangerous. The rest of the BSC decides that Betsy needs to be taught a lesson - and the joke war is on!

To a New York City girl like Stacey, the fact that an old - supposedly haunted - house in Stoneybrook is being torn down is no big deal. But then her friend Kristy discovers the house was built on a graveyard, and when Stacey sees a horrible face in one of the windows, she wonders if the house really could be haunted!

Mallory Pike has always wanted to be a member of the Baby-Sitters Club - they're so much fun to be around, and she's practically a baby-sitter already. Now the club members have invited Mallory to a meeting. This might be her big chance! But the BSC isn't making it easy - they make Mal feel like a baby on a job, and make her take an impossible written test. Mallory's beginning to think she doesn't want to be a part of the BSC...or maybe she and her new friend Jessi should start a club of their own. It's time to show those baby-sitters what a couple of new girls can do!