Books About Code-breaking

The Best Code-breaking Books for Kids

By the Bookroo Editors

Looking for excellent children's books about code-breaking? This collection brings together Bookroo's highest-rated and most useful picks in one place.

Start with our editorial favorites, then browse recommendations organized by reading stage to find the right book for your reader.

Europa
#7 in Series
Dark Days
Series
The Bletchley Riddle
The Messengers
#3 in Series
The Shortlist

Our 8 Favorite Books About Code-breaking

Europa
Sale price
$1797
Chapter Book · Ages 8–12 · 2026

Europa

By James Ponti · Book #7 in the City Spies series

Spies race to stop a criminal's escape and prevent attacks across Europe.

384 pages· 61,693 words· Est. 8.5 hour read
4.5/5 Goodreads · 1,761 ratings
$18.99Save 5%
Hardcover
Summary: The City Spies face their toughest mission yet as a criminal mastermind threatens chaos unless freed. Racing through Rome, Paris, London, and Amsterdam, they must solve cryptic codes and unravel clues to prevent disaster. Can they outsmart the villain and keep Europe safe?
Charlie Thorne and the Last Equation
Sale price
$858
Chapter Book · Ages 9–12 · 2019

Charlie Thorne and the Last Equation

By Stuart Gibbs · Book #1 in the Charlie Thorne series

A young genius must outsmart a sinister group to protect Einstein's hidden equation.

402 pages· 76,082 words· Est. 8.5 hour read
4.3/5 Goodreads · 7,627 ratings
$8.99Save 5%
Paperback
Summary: Charlie Thorne, a brilliant young code-breaker, is thrust into a global race against the Furies, a dangerous group seeking Einstein's hidden equation. With the CIA relying on her genius, Charlie must navigate a perilous world of secrets and deception. Can she crack the code and save humanity, or will the equation fall into the wrong hands? In this high-stakes adventure, trust is scarce, and the clock is ticking.
Dark Days
Sale price
$1797
Chapter Book · Ages 8–12 · 2015

Dark Days

By James Ponti · Dead City series

Molly must stop a zombie army threatening Manhattan's future.

304 pages· 58,286 words· Est. 8 hour read
4.3/5 Goodreads · 1,389 ratings
$18.99Save 5%
Hardcover
Summary: Molly Bigelow faces her greatest challenge as she battles the undead to save Manhattan. With her Omega team, she uncovers a plot by Marek Blackwell to fund a zombie army. As personal betrayals and a mysterious gold reserve come to light, Molly must race against time to thwart Blackwell's sinister plans. Can she protect her city and those she loves, or will the undead claim victory? Dive into a world where loyalty is tested and the stakes are life and death.
The Bletchley Riddle
Sale price
$1797
Chapter Book · Ages 8–12 · 2024

The Bletchley Riddle

By Ruta Sepetys, Steve Sheinkin

Siblings at Bletchley Park race to solve their mother's disappearance amid WWII secrets.

Golden Kite Honor (2025)
392 pages· 71,434 words· Est. 10 hour read
4.1/5 Goodreads · 16,699 ratings
$18.99Save 5%
Hardcover
Summary: In 1940, Jakob and Lizzie find themselves at Bletchley Park, the heart of WWII codebreaking. As Jakob tackles the Enigma cipher, Lizzie seeks answers to their mother's mysterious disappearance. With war looming and cryptic messages arriving, the siblings must unite to unravel a puzzle that could change everything. Are the codes a trap, or the key to their past? The clock is ticking, and secrets must be uncovered.
The Messengers
Sale price
$1697
Chapter Book · Ages 9–12 · 2021

The Messengers

By Margaret Peterson Haddix · Book #3 in the Greystone Secrets series

Mysterious coins warn of a looming threat across worlds. Can the Greystones save both realities?

416 pages· 75,688 words· Est. 8.5 hour read
3.9/5 Goodreads · 2,408 ratings
$17.99Save 6%
Hardcover
Summary: The Greystone kids, reunited with their mother, face a new threat as mysterious coins appear, urging them to act. With their doubles, the Gustanos, they must unravel secrets and confront a mind-controlling force threatening both worlds. As they journey across dimensions, they must solve the mysteries of the alternate world and find a way to defeat an evil that seems unstoppable. Will teamwork and courage be enough to save everything they hold dear?
Chasing Vermeer
Sale price
$858
Chapter Book · Ages 9–12 · 2004

Chasing Vermeer

By Blue Balliett, Brett Helquist (Illustrator) · Chasing Vermeer series

A vanished painting, a tangled mystery—can two kids solve the unsolvable?

273 pages· 43,472 words· Est. 5 hour read
3.7/5 Goodreads · 31,595 ratings
$8.99Save 5%
Paperback
Summary: Petra and Calder are thrust into a whirlwind of intrigue when a Vermeer painting vanishes. As they unravel a web of strange events and cryptic clues, they must outsmart an art thief and navigate a maze of suspicion. With an eccentric ally and their wits as their only tools, can they crack a case that baffles even the FBI? Dive into a world where every detail matters and nothing is as it seems.
The Enigma Plot
Chapter Book · 2010

The Enigma Plot

By Roderick Hunt, David Hunt, Alex Brychta (Illustrator) · TreeTops Time Chronicles series

Can they stop the Virans from rewriting history?

40 pages· 2,177 words
3.7/5 Goodreads · 6 ratings
Paperback
Summary: Biff, Chip, Kipper, and friends embark on thrilling time-travel adventures to thwart the sinister Virans. From Ancient Rome to Bletchley Park, they must protect history's integrity. Will they succeed in preserving the past, or will the Virans alter the course of time forever? Each journey reveals new challenges and secrets, testing their courage and ingenuity. As they uncover their true destinies, the stakes have never been higher. Can they prevent the unraveling of history, or will the Virans' plots succeed?
Archer
Sale price
$3250
Picture Book · Ages 8–12 · 2018

Archer

By Jenna Lynn, Abigail Dela Cruz (Illustrator) · Book #4 in the Robyn Hood series

A master thief faces a mysterious archer. Who will prevail?

48 pages· 955 words· Est. 8 min read-aloud
3.8/5 Goodreads · 8 ratings
$34.21Save 5%
Library Binding
Summary: Robyn Hood, a cunning master thief, encounters a mysterious archer who challenges her skills and wits. As their paths cross, secrets unravel and tensions rise. Can Robyn outsmart this enigmatic rival, or has she finally met her match? Dive into a world of intrigue and suspense where every move counts and the stakes are higher than ever.
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