Nina and the Keeper of the Keystone

Secret Society of Rebel Girls

Rebel Girls, Marti Dumas, Kristina Kister

$16.99

Paperback

Forthcoming
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English

Rebel Girls Inc
06 January 2026

Series: Secret Society of Rebel Girls

An exciting fantasy series from Rebel Girls.

Now that the Three Musketeers (and Kai) are best friends again, this is going to be the best year ever! But Nina's friends all seem to want her to take charge when all she wants to do is blend in. And on top of all that pressure, she's keeping two fluffy little secrets from her moms...

When the school's new superintendent ignores what the kids want, bringing in uniforms, shutting down clubs, and getting the best teachers in trouble, it's time for action! Luckily Nina and her friends can turn to the mysterious mailbox for answers, and soon they have Ruth Bader Ginsburg's advice in hand. Will it be enough to save Ada Lovelace Midde School and Ms. Jupiter? And will Nina finally feel ready to be a leader?

By: Rebel Girls, Marti Dumas
Illustrated by: Kristina Kister
Imprint: Rebel Girls Inc
Country of Publication: United States
Edition: 2nd edition
Dimensions: Height: 198mm, Width: 129mm,
ISBN: 9798889641131
Series: Secret Society of Rebel Girls
Pages: 320
Publication Date: 06 January 2026
Recommended Age: From 8 to 12 years
Audience: Children/juvenile , English as a second language
Format: Paperback
Publisher's Status: Forthcoming

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.