Yes, that Ann M. Martin, she of the Babysitters Club.
The cover wasn't released online until recently, so I was waiting for that to happen before posting. While it was also exciting to have worked on Sweet Valley Confidential this year, because I also loved that series when I was twelve-ish, the Babysitters Club was far and away my favorite (I think Kristy, Claudia, and the rest were a bit more pure than Jessica and Elizabeth and their friends).
Perfect for those with a slightly obsessive nature because there were 100+ books in the series, I was also so into how each chapter would start with a handwritten excerpt from the BSC journal, and how each girl had her own instantly identifiable handwriting (Mary Anne's looked like a grandma's handwriting, Claudia's was zany and full of misspellings and i's dotted with hearts).
So if you know any eight- or nine-year-olds, Ten Rules . . . is a sweet novel about the misadentures of Pearl and her older sister, Lexie, trying to get along with each other (and they live in a New York apartment in the Village). Also there is a Grandpa with Alzheimer's Issue.
