100,000+ Books, Games & Puzzles in-stock 🇳🇿

Overnight NZ-wide delivery on all in-stock orders 🚀

The Delta Codex

Brief Description
A girl whose subconscious contains dangerous ancient knowledge finds her voice in this "gripping… emotionally resonant" (School Library Journal, starred review) middle grade sci-fi fantasy perfect for fans of Diana Wynne Jones and Scott Reintgen. Is there safety in silence? In the city of Danak-Tol, children... Read More
Format: Hardback
$5000

International Supplier

This title is in-stock with overseas suppliers. While it is not available locally, we fly books in weekly from the US and UK to our Auckland warehouse for immediate dispatch.

AVAILABLE WITH SUPPLIER Ships from our Auckland warehouse within 2-3 weeks

Found a better price? Request a price match

Book Hero Magic formatted this description to make it easier to read. While it's new and still learning, it may not be perfect - your feedback is welcome! Description
A girl whose subconscious contains dangerous ancient knowledge finds her voice in this "gripping… emotionally resonant" (School Library Journal, starred review) middle grade sci-fi fantasy perfect for fans of Diana Wynne Jones and Scott Reintgen.

Is there safety in silence?

In the city of Danak-Tol, children known as codexes are chosen to safeguard echoes—fragments of ancient knowledge too valuable to destroy but too dangerous to use. Forbidden to speak lest she accidentally release her echo, codex Delta lives a lonely life. Still, she knows she must obey the wardens’ strict rules to keep her home safe from the vicious beasts, heretical Scrappers, and toxic blood storms that lurk beyond the city walls.

But when Delta breaks her vows to help a young girl escape a blood storm, she begins to have strange dreams, which lead her to question everything she knows to be true about herself and her city. To find answers, Delta must journey to the one place she most fears: the wasteland beyond the walls of Danak-Tol.

Together with her small but feisty mechanical companion Flick, Delta dares the perilous ruins of a long-abandoned skyship, the gullet of a ravenous sphincter worm, and even befriends a young Scrapper named Drii. But all these adventures only lead to more questions. What is the true danger that threatens her entire planet—is it really her echo, or is it the silence that has imprisoned the truth for so long?

Book Details

INFORMATION

ISBN: 9781665963572

Publisher: Simon & Schuster

Format: Hardback

Date Published: 14 April 2026

Country: United States

Imprint: Atheneum Books for Young Readers

Illustration: f-c jkt (uncoated: fx: emboss, spot gloss UV); digital

Audience: Children

DIMENSIONS

Spine width: 25.0mm

Width: 140.0mm

Height: 210.0mm

Weight: 358g

Pages: 288

About the Author

Deva Fagan writes fantasy and science fiction for all ages. When she’s not writing, she spends her time reading, doing geometry, playing video games, hiking, and drinking copious amounts of tea. She is the author of several books, including Rival MagicNightingaleThe MirrorwoodA Game of Noctis, and The Delta Codex. She lives in Maine with her husband and their dog. You can find her online at DevaFagan.com.

Also by Deva Fagan

View all

More from Children's Books

View all

Why buy from us?

Book Hero is not a chain store or big box retailer. We're an independent 100% NZ-owned business on a mission to help more Kiwis rediscover a love of books and reading!

Service & Delivery

Service & Delivery

Our warehouse in Auckland holds over 80,000 books, toys, board games and puzzles in-stock so you're not waiting for your order to arrive from overseas.

Auckland Bookstore

Auckland Bookstore

We're primarily an online store, but for your convenience you can pick up your order for free from our bookstore, which is right next door to our warehouse in Hobsonville.

Our Gifting Service

Our Gifting Service

Books make wonderful thoughtful gifts and we're here to help with gift-wrapping and cards. We can even send your gift directly to your loved one.