"Claudia's not worried when she hears her newest baby-sitting charge, Betsy Sobak, is a great practical joker. After all, how much harm can one little girl do? Plenty. Claudia breaks her leg as a result of one of Betsy's mean jokes... and now she's talking about quitting the club. Baby-sitting, she says, is just too dangerous. Kristy thinks Betsy needs to be taught a lesson. She also thinks the Baby-sitters are just the ones to do it. Watch out,...

Eleven-year-old Jessi copes with pet sitting for the Mancusi family and serious dissension among the members of the Baby-sitters Club.

Kristy needs the help of the Baby-sitters Club to find out who is sending her mysterious notes, which are mushy at first but then start getting weird and creepy.

"When Kristy Thomas has the great idea to form a baby-sitters club - a chance to earn money and spend time with her friends, all while doing something they each love to do - she has no idea how much the club will change everything. Crank calls, uncontrollable toddlers, wild pets, untruthful clients...running a business is hard work! Kristy and her co-founders, Mary Anne, Claudia, and Stacey, are sure they can handle anything. But only if they stick...

Stacey hasn't been feeling well. Her schoolwork and baby-sitting jobs are almost out of control. And Stacey's tired of being in the middle of her parents' fights. Stacey ends up in the hospital because of her diabetes.

Jessi's new teacher is shy and wears odd clothes and the students play jokes on him that Jessi thinks are funny, but when he leaves after she plays a prank on him, she feels awful about it.

Stacey is very excited to learn that Laine, her best friend from New York, is coming to visit Stoneybrook. But the minute Laine arrives, things don't go as planned. Laine is used to hanging out at high school parties and thinks Stacey and her friends are childish.

"This summer, the Baby-sitters and a whole bunch of the kids they sit for are going to Camp Mohawk! With the girls as Counselors-in-Training, and the kids as campers, it'll be just like baby-sitting--in the woods! The Baby-sitters soon discover that camp isn't just nature walks and making lanyards. Dawn gets lost in the wilderness overnight. Kristy learns how to use mascara, and Mary Anne gets caught sneaking over to the boys' side of the camp. Stacey...

Need a baby-sitter for Lou? Don't call the baby-sitters Club!

A discarded chain letter augers a series of bad events for Mary Anne, who is plagued by bad luck and a threatening note demanding a midnight meeting on Old Man Hickory's grave.