The Delta Codex
Apr 2026 · Sold by Simon and Schuster
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About this ebook
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?
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?
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-...
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Ratings and reviews
1 review
Sara Shkunova
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April 25, 2026
An engaging sci-fi dystopian fantasy set in a world that has been destroyed and ravaged by a fungi-like infestation. Delta is one of the keepers of the codices, a group of children that keeps the knowledge of their ancient founders within themselves lead very solitary lives where they're not allowed to interact with anyone else or even allowed to speak. But when a series of mishaps and circumstances occur, Delta finds herself thrown in the middle of an opposition political struggle, she learns of deception, manipulation, lies and hidden truths of what the world was before and why it is the way it is now. She ends up in an unwanted adventure with a group of other people in search of a way to end the infestation. The ending was a little bittersweet with the outcome a little somewhat disheartening and especially the tragic tale of the founder whose memories Delta is the keeper of. The voice narration by PJ Morgan was enjoyable to listen to with an easy pacing while the different voices were done well with the varying nuances and intonations. Overall quite entertaining!
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 Magic, Nightingale, The Mirrorwood, A 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.
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 Magic, Nightingale, The Mirrorwood, A Game of Noct...
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