The Baby-Sitters Club did its share of issues books, but none of them are more nuanced than Jessi's Secret Language. In the book, Jessi gets a regular job watching a little boy named Matt who has been deaf since birth. In order to communicate with him, she begins learning ASL and encourageing other children in the neighbourhood to learn too. Her efforts showcase just how empathetic Jessi is, and how far she's willing to go to make others feel included. Add in a ballet subplot that dovetails with the main story in an emotional way, and you have a true classic BSC novel.