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.