Children's Mystery Books

Mystery Books for Grades 1 - 6

Updated June 18, 2026
C
City of Mission Viejo Library
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Agent Moose
O'Hara, Mo
Paper Book
Agent Moose, the best (worst) secret agent in the Big Forest, and his slightly-more-intelligent sidekick Owlfred are on the case in this new full color graphic novel chapter book series from Mo O'Hara, author of My Big Fat Zombie Goldfish, illustrated by Jess Bradley!...

AR: 3.0

Lexile: 400

Banana Fox and the Secret Sour Society
Kochalka, James
Paper Book
Eisner Award-winning cartoonist James Kochalka makes his Graphix Chapters debut with this laugh-out-loud mystery series! Get drawn into reading with Graphix Chapters! Graphix Chapters are ideal books for beginning and newly independent readers aged 6-8. With approachable page...

AR: 2.5

Lexile: 520

The case of the strange splash
Winkler, Henry
Paper Book
From New York Times bestselling creators--Emmy Award-winning actor Henry Winkler, children's book author Lin Oliver, and Caldecott Medal-winning author-illustrator Dan Santat--comes Detective Duck: The Case of the Strange Splash, a hilarious, full-color...

AR: 3.9

Lexile: 680

Cosmos Camp
Giles, Lamar
Paper Book
An Edgar Allan Poe Award Nominee! From Edgar Award nominee and WNDB cofounder Lamar Giles, this middle grade adventure stars the Epic Ellison twins as they race to solve the mystery of Cosmos Camp for young geniuses in a stand-alone companion to the Legendary Alston Boys series. ...

AR: N/A

Lexile: 830

Escape from Mr. Lemoncello's library
Grabenstein, Chris.
Paper Book
THE START OF THE NEW YORK TIMES BESTSELLING SERIES WITH MORE THAN TWO MILLION COPIES SOLD! Can you escape from what James Patterson calls "the coolest library in the world"? Follow along and solve the clues in this interactive adventure! From the co-author of Murdle...

AR: 4.5

Lexile: 720

The ghost tree
Deen, Natasha
Paper Book
Is it science...or strange and ghostly? Asim's new town is freaking him out! There are weird noises at night, eerie lights, and now an evil tree that is growing way faster than it should. he's sure there's something supernatural going on. His friend Rokshar...

AR: N/A

Lexile: 440

King and Kayla and the case of the missing dog treats
Butler, Dori Hillestad
Paper Book
King & Kayla are back on the case in this laugh-out-loud mystery from the Theodor Seuss Geisel Honor Award-winning series. Kayla made peanut butter treats for Thor, Jillian's new puppy. But now the treats are missing, and King is under suspicion. Analytical Kayla...

AR: 2.2

Lexile: 440

Murder is bad manners
Stevens, Robin
Paper Book
Two friends form a detective agency--and must solve their first murder case--in this "sharp-witted debut" (Publishers Weekly, starred review) that is the first adventure in a brand-new middle grade mystery series set at a 1930s boarding school. Daisy Wells and Hazel Wong...

AR: 5.9

Lexile: 910

Mystery in Rocky Mountain National Park
Johnson, Aaron
Paper Book
Before Jake's grandfather died, he was on the trail of a centuries-old mystery. And he has entrusted that mystery to Jake, leaving behind a set of hidden codes, riddles, maps, and other clues that lead Jake and his friends on a scavenger hunt into the heart of Colorado's wild and rugged Rocky...

AR: 4.8

Lexile: N/A

The mystery of locked rooms
Currie, Lindsay
Paper Book
*Instant New York Times and USA Today bestseller!* Crack the codes. Find the treasure. Escape the house. From the acclaimed author of Scritch Scratch and What Lives in the Woods comes a action-packed adventure novel about three friends who team up to find a hidden treasure in an...

AR: 4.4

Lexile: 620

The mystery of the stinky, spooky night
Manushkin, Fran
Paper Book
When Pedro and his dad walk Katie home on a foggy night, something smelly fills the air! With their noses working extra hard, the two friends have a mystery to solve: What is that making that stink, and why is it following them?

AR: 2.0

Lexile: 440

The newspaper club
Vrabel, Beth
Paper Book
Learn what it means to be a journalist in this fun, fast-paced new middle grade series about a club of kid reporters by an award-winning author. Nellie Murrow -- the daughter of two (former) newspaper reporters -- was named after one of the fiercest journalists who...

AR: 4.6

Lexile: 710

The Sherlock society
Ponti, James
Paper Book
A New York Times bestseller! In the tradition of Nancy Drew, four kids and one grandfather in Miami tackle a decades-old mystery in this first book full of "atmosphere, history, and lively humor" (Publishers Weekly, starred review) in the Sherlock Society middle...

AR: 4.9

Lexile: 770

Shirley & Jamila save their summer
Goerz, Gillian
Paper Book
This middle-grade graphic novel for fans of Roller Girl and Smile introduces Jamila and Shirley, two unlikely friends who save each other's summers while solving their neighborhood's biggest mysteries. Jamila Waheed is staring down a lonely summer in a new...

AR: 2.8

Lexile: 490

Super Max and the mystery of Thornwood's revenge
Vaught, Susan
Paper Book
"An excellent addition to middle grade shelves, with a differently-abled main character that readers will root for." --School Library Journal "Vaught makes Max the brash, bold star of the book, exchanging stereotypes and sympathy cards for a well-drawn character whose...

AR: 5.5

Lexile: 820

Under locker and key
Hymas, Allison K.
Paper Book
Eleven-year-old Jeremy Wilderson teams up with his rival crime fighter to stop the stealing spree that's wreaking havoc on Scottsville Middle School in this action-packed MAX novel. Jeremy Wilderson is not a thief. In fact, he is his middle school's one and only retrieval...

AR: 4.6

Lexile: 630


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