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 Sutcliff's grave.

When her mother's remarriage takes her family into a much wealthier neighborhood, thirteen-year-old Kristy finds herself surrounded by snobbish girls who compare clothes, make fun of the Baby-sitters Club, and insult her aging dog.

Working as a mother's helper, with Stacey, for the Pike family at the Jersey shore, Mary Anne is upset when Stacey begins to neglect her job to spend her time pursuing a gorgeous lifeguard.

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.

Eleven-year-old Rick Ramsey has generally gone along with everybody, just not making waves, even though he is increasingly uncomfortable with his father's jokes about girls, and his best friend's explicit talk about sex; but now in middle school he discovers the Rainbow Spectrum club, where kids of many genders and identities can express themselves--and maybe among them he can find new friends and discover his own identity, which may just be to opt...

Eleven-year-old Mallory is excited when it looks like she may be invited to join the Baby-sitters Club, but the baby-sitters have to learn some lessons in fairness first.

Annoyed that Sister Bear always beats them at baseball and other "boy" type activities, her brother and the other male cubs try to exclude her from their new club.

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.

Astrid is excited about her upcoming first year of Shooting Stars, a club dedicated to all things space, but now that her best friend Hallie is more interested in art Astrid is not sure her goal of becoming an astronaut will happen without her friend.

Summer vacation in their small Maine town does not look too promising until twelve-year-old Gina and four of her friends make a pact to become millionaires before school starts in September