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 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...

While searching for the Rat with the Human Face, friendships fray as club members Dave and Lyle compete for Marilla.

During the annual initiation of members into the exclusive Legacy Club, the surprise nomination of Tori Tasso, a scholarship student, jeopardizes the club's clandestine truths and leads to a perilous Legacy Ball where one attendee does not make it out alive.

Members of the Critter Club are all excited about their summer plans until Liz learns that, instead of taking an art class, she will have to be in summer school to improve her math skills, but a fun teacher, a classroom pet, support from her friends, and advice from her brother might get her through.

Kristy, Mary Anne, Stacey, Claudia, and Dawn are the luckiest baby-sitters in the world. This summer they're going on the greatest trip ever: a plane ride to Florida, a boat trip around the Bahamas, and then three days of fun -- in Disney World!

Despite her parents' rules about the Qwikpick Adventure Society, Marilla and her friends are off on another adventure when they hear a local legend about a slave owner's grave.

Maude hopes her newfound knowledge of fireflies will win her a spot in the neighborhood Bug-of-the-Month Club, but Louise, the club's hard-to-please leader, will not let her join.

In a post-apocalyptic world, AV (Anti-Violence) Club members Tip, Mindy, Owen, and Xen develop semi-super powers and use them to try to save their middle school.

Follows the adventures of Kristy and the other members of the Baby-sitters Club as they deal with crank calls, uncontrollable two-year-olds, wild pets, and parents who do not always tell the truth.