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The Explorer's Code

by Allison K Hymas

Subject
Mysteries & Detective Stories
Age
6-8 years
Format
Trade Paperback
Pages
304
Publisher
Square Fish
Size
13.3 cm × 19.4 cm
ISBN
9781250802781

Three kids have everything they need to solve the decades-old mystery of Idlewood Manor, in this middle grade novel full of real ciphers, puzzles, riddles, and codes that Kirkus Reviews calls "a worthy call to unravel a mystery.”

Idlewood Manor has been uninhabited for decades, until now . . .

Math whiz Charlie won admission in a puzzle contest—and he’s intrigued by the strange numbers he finds on Idlewood’s walls. His restless sister Anna had to be dragged to the house—but then she discovers its hidden floor. Emily’s parents brought her to the mansion on a secret mission—and she’s determined to prove herself to them.

All three kids soon unlock clues to Idlewood’s mysterious past and the famous female explorer who’s connected to it—and the secret treasure she left behind. But the adults around them are also hunting for the treasure. Charlie, Anna, and Emily will have to overcome their differences and work as a team to solve Idlewood’s puzzles before it’s too late, in Allison K. Hymas's The Explorer's Code.

An Imprint Book

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What reviewers said

A Junior Library Guild Gold Standard Selection
“Full of puzzles and intrigue, this is a delectable treat for readers wanting a brainteaser or two in an intricately paced package.”
K irkus Reviews
"The Explorer's Code contains the perfect trifecta for middle-grade readers: buried secrets, puzzles to decode, and a dark, creepy old manor house to explore. A great addition to the adventure genre." —Suzanne Selfors, national bestselling author of The Imaginary Veterinary series and Braver
“This mystery is a NFHG-IVZW*. For sharp readers who love uncovering secrets, The Explorer’s Code is the perfect puzzler! Hymas weaves a mystery with layers, depth, and plenty of delicious twists. It’s a joy to go on an adventure with courageous Anna, analytical Charlie, and knowledgeable Emily! Clever and captivating, The Explorer’s Code is 2-18-9-12-12-9-1-14-20**. Put on your thinking cap before entering Idlewood Manor . . . you’ll need it!” —Lauren Magaziner, author of the Case Closed series
*MUST-READ **brilliant
(Look inside the book for how these and other ciphers work!)
© 2026 Peekabooks Inc. All Rights Reserved.
© 2026 Peekabooks Inc. All Rights Reserved.