![Claudia and the Middle School Mystery (The Baby-Sitters Club #40) (1991, Scholastic)](https://st2.ap-south-1.linodeobjects.com/images/covers/baca3096-806b-4811-8266-36ea90d17a83.jpeg)
Claudia and the Middle School Mystery (The Baby-Sitters Club #40) by Ann M. Martin
For once, Claudia's studied really really hard for her math test. And when Claudia gets her paper back, it has …
For once, Claudia's studied really really hard for her math test. And when Claudia gets her paper back, it has …