Trying to help her hard-working father and twin sister to adjust to life in Stoneybrook, Abby Stevenson becomes the newest member of the Baby-sitters Club and shares her first adventure.

Trying to cheer up her twin, Anna, who has been diagnosed with scoliosis, Abby fears that the condition is driving them apart when Anna seems to not want Abby's help and begins to do things on her own.

When soccer season comes to Stoneybrook, Abby joins a Special Olympics Unified Sports soccer team but develops a fierce rivalry with another player.

From the bestselling author of the generation-defining series The Baby-sitters Club comes a series for a new generation! So I gues this makes me an official SMS student--I'm writing my autobiography just like every other eight-grader here. This hasn't been easy. It's a big job, plus it's very emotional for me. Looking through all the family photos has made me remember some pretty difficult times. My family has been through a lot, but it hasn't all been bad. There was the period when my sister and I had to be color-coded so people could tell us apart! And then there was the crazy move to Stoneybrook, and my unforgettable first meeting with Kristy Thomas. So now here I am, a stoneybrookite, working on my first major school project. I sincerely hope I don't blow it.

When her troubles in school culminate in her being dropped back to the seventh grade, Claudia struggles with feelings of failure while adjusting to classmates outside of the Baby-sitters Club.

Writing a Thanksgiving play for the third-grade class she coaches, Claudia is disappointed when some parents object to her less-than-traditional themes, and she must choose between letting the other kids down or fighting censorship.

From the bestselling author of the generation-defining series The Baby-sitters Club comes a series for a new generation! It's the day the members of the BSC had thought would never come-- the day they graduate from Stoneybrook Middle School. Kristy is worried that this will mean the end of the BSC. Mary Anne realizes she has to set things straight with her ex-boyfriend, Logan. Stacey is stressed about her parents, And claudia isn't sure she'll be allowed to graduate at all. As graduation day comes closer, all the past and present BSC members come together to share their stories of Stoneybrook and the BSC. It's time for them to say good-bye. But their memories and their friendships will last forever.