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Nina and the Keeper of the Keystone by Rebel Girls and Marti Dumas
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Nina and the Keeper of the Keystone

Secret Society of Rebel Girls

Secret Society of Rebel Girls

Secret Society of Rebel Girls

By Rebel Girls and Marti Dumas
Illustrated by Kristina Kister

By Rebel Girls and Marti Dumas
Illustrated by Kristina Kister

By Rebel Girls and Marti Dumas
Illustrated by Kristina Kister

By Rebel Girls and Marti Dumas
Illustrated by Kristina Kister

By Rebel Girls and Marti Dumas
Illustrated by Kristina Kister

By Rebel Girls and Marti Dumas
Illustrated by Kristina Kister

Best Seller

Part of Secret Society of Rebel Girls

Part of Secret Society of Rebel Girls

Paperback $9.99

Oct 14, 2025 | ISBN 9798889641025 | Middle Grade (8-12)

Hardcover $16.99

Oct 14, 2025 | ISBN 9798889641162 | Middle Grade (8-12)

Ebook $5.99

Oct 14, 2025 | ISBN 9798217137879 | Middle Grade (8-12)

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    Nina and the Keeper of the Keystone by Rebel Girls and Marti Dumas
    Hardcover $16.99
    Oct 14, 2025 | ISBN 9798889641162

    Preorder from:

    See All Formats (2) +
    • $9.99

      Oct 14, 2025 | ISBN 9798889641025 | Middle Grade (8-12)

      Preorder from:

    • $16.99

      Oct 14, 2025 | ISBN 9798889641162 | Middle Grade (8-12)

      Preorder from:

    • Oct 14, 2025 | ISBN 9798217137879 | Middle Grade (8-12)

      Preorder from:

    Buy the Ebook:

    About Nina and the Keeper of the Keystone

    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 . . .

    About Nina and the Keeper of the Keystone

    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 . . .

    About Nina and the Keeper of the Keystone

    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 . . .

    Also by Rebel Girls

    Rebel Girls Just Like Me
    Rebel Girls 5-Minute Stories
    El dinero importa (Rebel Girls Money Matters)
    Vida social: guía de supervivencia (Rebel Girls Social Situation Survival Guide)
    Rebel Girls STEM Stars: 25 Tales of Women in Science
    See all books by Rebel Girls

    Also by Rebel Girls

    Rebel Girls Just Like Me
    Rebel Girls 5-Minute Stories
    El dinero importa (Rebel Girls Money Matters)
    Vida social: guía de supervivencia (Rebel Girls Social Situation Survival Guide)
    Rebel Girls STEM Stars: 25 Tales of Women in Science
    See all books by Rebel Girls

    Also by Rebel Girls

    Rebel Girls Just Like Me
    Rebel Girls 5-Minute Stories
    El dinero importa (Rebel Girls Money Matters)
    Vida social: guía de supervivencia (Rebel Girls Social Situation Survival Guide)
    Rebel Girls STEM Stars: 25 Tales of Women in Science
    See all books by Rebel Girls

    About Rebel Girls

    Rebel Girls is a global, multi-platform entertainment brand, dedicated to inspiring and instilling confidence in a generation of girls around… More about Rebel Girls

    About Rebel Girls

    Rebel Girls is a global, multi-platform entertainment brand, dedicated to inspiring and instilling confidence in a generation of girls around… More about Rebel Girls

    About Rebel Girls

    Rebel Girls is a global, multi-platform entertainment brand, dedicated to inspiring and instilling confidence in a generation of girls around… More about Rebel Girls

    Product Details

    Category: Children’s Middle Grade Mystery

    Paperback | $9.99
    Published by DK Children
    Oct 14, 2025 | 320 Pages | 5-1/16 x 7-13/16 | Middle Grade (8-12) | ISBN 9798889641025

    Category: Children’s Middle Grade Mystery

    Hardcover | $16.99
    Published by DK Children
    Oct 14, 2025 | 256 Pages | 5-1/16 x 7-13/16 | Middle Grade (8-12) | ISBN 9798889641162

    Category: Children’s Middle Grade Mystery

    Ebook | $5.99
    Published by DK Children
    Oct 14, 2025 | 320 Pages | Middle Grade (8-12) | ISBN 9798217137879

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