Nina and the Keeper of the Keystone: Secret Society of Rebel Girls
By (Author) Rebel Girls
By (author) Marti Dumas
Illustrated by Kristina Kister
Rebel Girls Inc
Rebel Girls Inc
6th January 2026
2nd October 2025
2nd edition
United States
Children
Fiction
Childrens / Teenage fiction: Crime and mystery fiction
Childrens / Teenage fiction: Fantasy
Childrens / Teenage fiction: School stories
Childrens / Teenage personal and social topics: School, education and teachers
Paperback
320
Width 129mm, Height 198mm
An exciting fantasy series from Rebel Girls. In book two, Nina and her friends realize they can use the mysterious mailbox to help their fellow students deal with their problems. Soon there's a stream of kids looking for advice. Not wanting to divulge their secret to other students, they say that they merely draw on history to give their advice. But when a student takes the advice from a letter Marie Curie sent a little too literally, almost blowing up the science wing, their operation is forced underground. What's worse, a new principal arrives on a mission to improve standards, and he seems to know a little more about Ada Lovelace Middle School than he's letting on... 2025 Rebel Girls, Inc.
Marti Dumas is a mom, teacher, writer, and creative entrepreneur from New Orleans. An expert in childhood literacy, Marti has worked with children and teachers across the country for the last 15 years to promote an early love of reading both in and out of the classroom. Her best-selling Jaden Toussaint, the Greatest series combines literacy with STEM skills and humor, and adds much-needed diversity to the children's chapter book landscape. Her latest book, Wildseed Witch, is a middle-grade fantasy that is already being heralded for its skillful combination of technology, history, and magic.