When Dawn announces that she is moving back to California, the other Baby-sitters cannot believe that she would even consider leaving them.

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.

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.

When Dawn's brother Jeff comes from California for a visit, a nice, peaceful family reunion erupts into a feud between the Schafers and the Spiers.

Deciding that she wants to move back to California permanently, Dawn worries about what she will say to the rest of the baby-sitters, who do not understand when they hear the news secondhand.

Dawn loves Stoneybrook but she misses her other life too... in California. So she's made the decision to move back there for 6 months. But what will everyone do without her...?

It's a Baby-sitters Club shocker--Dawn's moving back to California for six months to live with her dad.