Dawn and Mary Anne are finally stepsisters and also roommates. When they begin to get on each other's nerves, Dawn comes up with a solution which pleases everyone.

One of a series of stories that revolve around the babysitters club. Dawn and Mary Anne are now stepsisters, but perhaps sharing parents and a bedroom isn't such a good idea. Dawn thought she'd always wanted a sister, but she didn't count on Mary Anne - the wicked stepsister.

After Dawn's mom marries MaryAnne's dad, the two friends, suddenly sisters, find their home turned into a battlefield, until Dawn realizes that her new stepsister only needs some room in which to breathe.

Dawn and Mary Anne are good friends, but when they become stepsisters, their relationship undergoes some changes.

At long last, Dawn's mother and Mary Anne's father have decided to get married!

The rest of the Baby-sitters are shocked when Mary Anne, tired of being a plain Jane, gets a chic new haircut and a new wardrobe, and their reaction enrages the excited Mary Anne.

Kristy looks for a way to help a little girl with autism in this special entry in the classic hit series. Kristy’s newest baby-sitting charge is Susan Felder, who goes away to a special school. Susan isn’t like most kids. While she can play the piano and sing beautifully . . . she can’t talk to anyone. Susan is autistic. She lives locked inside her own secret world. Kristy thinks it’s unfair that Susan has to be sent off to school and is treated differently from everyone else. But Kristy’s going to try to change that—by showing everyone that Susan’s a “regular” kid, too. And then maybe Kristy’s new friend can stay in Stoneybrook for good. The best friends you’ll ever have—with classic BSC covers and a letter from Ann M. Martin!