33 Best Mystery Books For 4th Graders (Age 9)

For 4th graders, mystery books offer an engaging combination of suspense, problem-solving, and excitement. These stories not only captivate young readers but also help boost their mental and analytical skills.

In this post, we will explore 33 Best Mystery Books For 4th Graders.

In fact:

The mystery books mentioned in this post are based on comprehensive research and reviews and are considered some of the best Mystery Books for 4th Graders.

Are You In a Hurry?

If you’re in a hurry, your search is over! We have selected three highly recommended mystery books.

Overview Of The 33 Best Mystery Books For 4th Graders

Let’s dive right in…

Note: You can purchase these books by clicking on the title link. Please note that the links to purchase these books are affiliate links from Amazon.

Zion Gold Rush

“Zion Gold Rush” by C. R. Fulton. Isaiah’s family goes on a trip with his dad. At an event, Isaiah, Sadie, and Ethan know about a hidden gold mine in Zion National Park. While exploring, they find an old area with strange symbols on a stone. They try to understand the message and if it’s connected to treasure. Be part of their adventure filled with mysteries and search for hidden treasure.

The Cardinals Caper

In “The Cardinals Caper” by David A. Kelly, join Mike and Kate as they experience a special day in St. Louis. They meet horses before a game and a Dalmatian. But during the game, the Dalmatian goes missing! The duo discovers a note and demands to return the dog. Now, Mike and Kate must solve the mystery, catch the fugitive, and rescue the pup.

Rocky Mountain Challenge

Join the Kids in “Rocky Mountain Challenge” by C. R. Fulton as they dive into Survival Week at Camp, where they learn essential skills for surviving. Divided into teams, the campers compete in various challenges, encouraging teamwork and unity. Experience a week of challenges in this adventure.

The Colorado Curveball

In “The Colorado Curveball” by David A. Kelly, Mike and Kate visit a snowy baseball stadium in Colorado. They have a heater to melt the snow for the game, but a strange note gets their attention. They start investigating and end up in exciting places in the mountains. Get ready for a fun adventure as they try to solve this exciting mystery.

Grand Canyon Rescue

“Grand Canyon Rescue” by C. R. Fulton. Isaiah, Sadie, and Ethan find a box with their names in the Grand Canyon. Inside is a secret message with clues. As they follow the clues, they discover a piece of fabric that asks for Help. The kids are curious and want to understand this clue. Join them as they solve the mystery and find the truth in this thrilling story.

Discovery in Great Sand Dunes

“Discovery in Great Sand Dunes” by Aaron Johnson, after camping in Rocky Mountain National Park, Jake and his friends head to Great Sand Dunes in Colorado. Among the dunes, they find something risky. As their adventure unfolds, Jake’s friendships and honesty are tested with choices. Join Jake, Amber, and Wes as they explore national parks, and learn about survival, history, and being good friends.

The Triple Play Twins

Join Mike and Kate in “The Triple Play Twins” by David A. Kelly. They’re excited to meet famous baseball twins Marco and Pedro. But strange things happen, water balloons are thrown at the players, and someone runs away. Mike and Kate start investigating. Together, can they solve the mystery?

MNSDHFGV Adventure

“MNSDHFGV Adventure” by Aaron Johnson. Jake and his friends explore the Grand Canyon, facing challenges and testing their friendship. They follow clues from Jake’s grandfather’s book and work together to solve a secret. Join Jake and his friends as they explore the Grand Canyon, and solve mysteries.

The Atlanta Alibi

Join the team in “The Atlanta Alibi” by David A. Kelly as Mike and Kate head to Atlanta. They’re on a mission to solve the mystery of the missing historic bat and ball. With their skills, the cousins are determined to find it before they’re lost forever.

The Black Cat Change-Up

Join Kate and Mike in “The Black Cat Change-Up” by David A. Kelly. They are in New York for a baseball game, but there’s a problem. A black cat is scaring Cookie, the team’s best hitter. This bad luck could make the team lose. Can Kate and Mike find out why the cat is there and stop it?

Nate the Great and the Tardy Tortoise

In “Nate the Great and the Tardy Tortoise” by Marjorie Weinman Sharmat, it’s a sunny day, and Nate the Great finds a green tortoise! Nate decides to follow the tortoise as it crosses the lawn. But where does this tortoise really belong? Nate uses his sharp eyes to solve the mystery. Join Nate as he takes his time to find the truth about the tortoise’s journey.

Camping Chaos

Join Frank and Joe on an exciting camping adventure in “Camping Chaos” by Franklin W. Dixon. The brothers are thrilled about the Camping event. Winning the tent decorating competition is a big goal for them. But when their decorations vanish and strange sounds appear at night, Frank and Joe realize something’s wrong.

Among the Hidden

“Among the Hidden” by Margaret Peterson Haddix tells the story of Luke, who lives in a world where families are only allowed two children. Luke is a third child, which is against the rules. He has to stay hidden. But when he sees another child in a nearby house, he meets Jen, who is also a hidden child. They come up with a plan to escape from their hidden lives. This book talks about being brave and fighting for justice.

The Baltimore Bandit

Join Mike and Kate in “The Baltimore Bandit” by David A. Kelly. Babe Ruth’s glove is missing from the baseball park. Can they solve the mystery and find the glove’s thief?

The Great Escape

In “The Great Escape” by Franklin W. Dixon, there’s a show with amazing animals at Bayport. Jack and Little Jim bring some animals. But, the Boa goes missing! Now Frank, Joe, and their friends turn into detectives to find it. Can they solve the mystery?

Nate the Great and the Pillowcase

In “Nate the Great and the Pillowcase” by Marjorie Weinman Sharmat, it’s very late at night when Nate the Great gets a call for help. Rosamond’s pillowcase has gone missing, and Nate is ready to solve the mystery! Nate is determined to find the pillowcase. With his detective skills, he starts looking for clues. Can Nate solve the case?

Ship of Secrets

Join the Hardy family on a summer adventure in “Ship of Secrets” by Franklin W. Dixon. Frank and Joe are enjoying exciting activities on the ship. But things take a twist when they discover that a valuable watch has been stolen. Get ready for a suspenseful mystery full of fun!

Nate the Great Saves the King of Sweden

In “Nate the Great Saves the King of Sweden” by Marjorie Weinman Sharmat, join Nate the Great on an exciting adventure. Nate’s friend Rosamond is far away in Scandinavia and she needs help finding something she lost. Even though Rosamond might ask the King of Sweden for help, Nate wants to solve the mystery himself.

The Woodshed Mystery

In “The Woodshed Mystery” by Gertrude Chandler Warner, the Boxcar Children begin on a visit to their Grandfather’s childhood farmhouse. However, the nearby townspeople sense something wrong about the house. Eager to find the truth, the Children dive into an investigation that reveals secrets from the farm’s history. Join them in this mystery that uncovers hidden stories from the past.


In “Hoot” by Carl Hiaasen, everyone loves the pancakes from Mother Paula’s restaurant. But there’s a problem, cute owls live where they want to build a new restaurant. A new kid and his wild friend try to stop the restaurant. Join them in this journey of kindness and empathy.

Spy Camp

Join middle schooler Ben Ripley in “Spy Camp” by Stuart Gibbs as he faces another adventure. After a year of spy training, Ben is looking forward to a relaxing summer. However, his plans take a turn when he’s sent to a camp for spy survival training. Unknown to him, the enemy organization has entered the camp. Now, Ben must use his spy skills to find the enemy.

The Invention of Hugo Cabret

Join Hugo in “The Invention of Hugo Cabret” by Brian Selznick. He lives secretly in a train station. One day, he meets a unique girl and a man. Their lives connect, and Hugo’s hidden life is in danger. They give Hugo a secret message from his father, the story creates an exciting mystery full of emotions and magic.

The Egypt Game

In “The Egypt Game” by Zilpha Keatley Snyder, Melanie and April love ancient Egypt. They find an empty space and start the Egypt Game with four friends. But strange things happen, making them wonder if the game is getting too real. Join them in this interesting story about imagination and mysteries.

Secrets of the Last Pirate

Join Timmi, Lilli, and Marvin in “Secrets of the Last Pirate” by J. I. Wagner. They explore the Caribbean Sea and find a pirate treasure ship. As they visit there, they start following a trail that leads to an ancient secret. However, they face challenges as an opponent tries to stop them. Get ready for a thrilling journey filled with mystery and adventure!

Chasing Vermeer

“Chasing Vermeer” by Blue Balliett. When Petra and Calder meet, lots of strange things start happening and they meet an old woman. A valuable painting by Vermeer goes missing. They become part of a big art mystery. People start suspecting each other, including Petra and Calder. They use their problem-solving skills to try and solve the mystery.

Evil Spy School

In “Evil Spy School” by Stuart Gibbs, a boy named Ben Ripley messes up during a spy game at school and gets kicked out. But then something strange happens, Ben gets asked to join a bad group called SPYDER, and he says yes. Ben wants to find out their secrets. Come along with Ben on this adventure to beat the bad guys.

Greystone Secrets

In “Greystone Secrets” by Margaret Peterson, there are three kids named Chess, Emma, and Finn who live happily with their mom. But when they hear about other kids with the same names and ages being kidnapped, they get worried. Even their birthdays are the same. Then their mom goes away for work suddenly, and they find strange clues in their house. The kids must solve the mystery. Join Chess, Emma, and Finn on a journey with many surprises and twists.

The Yellow House Mystery

In “The Yellow House Mystery” by Gertrude Chandler, the old yellow house on Surprise Island holds a secret. Many years ago, a man disappeared from the house, and nobody knows why. The Alden children find a clue that leads them to investigate this mystery and embark on a new adventure.

The Deceivers

In “The Deceivers” by Margaret Peterson Haddix, Chess, Emma, Finn, and Natalie find themselves in a world completely different from their own after their mother disappears. Determined to rescue their trapped loved ones, the four kids must return to this dangerous world and face their fears, doubts, and challenges.

Mike’s Mystery

In “Mike’s Mystery” by Gertrude Chandler, the Alden siblings return to Mystery Ranch for another summer. And their friend Mike lives in the nearby town of Yellow Sands. However, trouble arises when a house fire occurs and Mike is captured for causing it. The Aldens take it upon themselves to find the truth and clear their friend’s name. Join them on this suspenseful journey as they work to find the truth and help Mike.

The Messengers

In “The Messengers” by Margaret Peterson Haddix, the Greystone kids have their mom and friend Natalie back, but the danger isn’t over. Special messages appear that ask for their help. The messages warn that their friends from the other world are in trouble, and the bad forces are coming to their world too. With teamwork, they must solve old mysteries.

Blue Bay Mystery

In “Blue Bay Mystery” by Gertrude Chandler, the Boxcar Children join their Grandfather on a trip to an island in the South Seas. The Alden siblings notice strange signs that hint they might not be the only ones there. As they begin an exciting exploration, the mystery unfolds, taking readers on a journey of discovery.

Spy Ski School

In “Spy Ski School” by Stuart Gibbs, Ben Ripley faces challenges at Spy School, struggling with his studies but excelling at survival outside of class. Now, the CIA wants to put his skills to the test by assigning him a real mission. However, when his best friend joins the mission, everything hangs in the balance. Join Ben on this thrilling adventure filled with spying, friendship, and unexpected twists.


We hope that our list of mystery books has given you some great options to choose from and you and your 4th grader will have fun while exploring these mysterious books together.

The mystery books recommended in this list have been thoroughly researched and reviewed, and are considered some of the best Mystery Books For 4th Graders. While I may not have personally read all of them, they have been highly recommended by other readers.

We would love to hear from you about which book your 9 year old enjoyed the most, or if there is a favorite book that we missed. Please leave your comments and feedback below.

Best wishes and happy reading to you and your family!

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