Nina and the Keeper of the Keystone: Secret Society of Rebel Girls -- Rebel Girls, Hardcover

In book two, Nina and her friends realize they can use the magical 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 . . .

Author: Rebel Girls, Marti Dumas
Publisher: DK Publishing (Dorling Kindersley)
Published: 10/14/2025
Pages: 256
Binding Type: Hardcover
ISBN: 9798889641162
Audience: Ages 9-12

About the Author
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.

Yaoyao Ma Van As is a Los Angeles-based art director, painter, illustrator, and occasional animator. She has worked at Disney TV Animation, Warner Brothers Animation, Rick and Morty, Stoopid Buddy Studios and Starburns Industries.

Yaoyao Ma Van As is a Los Angeles-based art director, painter, illustrator, and occasional animator. She has worked at Disney TV Animation, Warner Brothers Animation, Rick and Morty, Stoopid Buddy Studios and Starburns Industries.