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Florian is 12 years old and has just moved to Washington. He's learning his way around using TOAST, which stands for the Theory of All Small Things. It's a technique he invented to solve life's little mysteries. But when he teaches it to his new friend Margaret, they uncover a mystery that isn't little. In fact, it's huge, and it involves the National Gallery, the FBI, and a notorious crime syndicate known as EEL. Can Florian decipher the clues and finish his homework in time to help the FBI solve the case?

Jessie wants her science fair project to make a difference. So when she gets the chance to test a local creek for pollution, she can’t wait to get started. But when things start going wrong with her experiment, Jessie and her siblings don’t just have an experiment to investigate, they have a...

Hannah's neighborhood has gotten a little--weird. Ever since that new boy moved in next door. But when did he move in? Wasn't the house empty when Hannah went to sleep the night before? Why does it still look so deserted? Hannah can't get any answers from her new neighbor. He just keeps disappearing in the oddest ways. And he's so pale...Is Hannah being haunted by... the ghost next door?

An abandoned mansion, strange noises, and secret spies. Detective duo Alice and Theo reunite with their East End friends to solve a new mystery in Edwardian London. Their curiosity is awakened when sounds come from the spooky house next door. A plea for help catapults the gang into a thrilling chase. Join them as they dash across historic sites from the British Museum to hidden catacombs in a fast-paced action adventure.

Harriet, Jack, and Toby are treasure hunters, searching the Minecraft world for its most valuable hidden secrets. In an abandoned mineshaft, they discovered the first of three lost journals that once belonged to William, a legendary explorer who has gone missing. The journals have taken them on a daring adventure to a secret temple deep within a desert biome, then into the perilous depths of the Nether. Now the treasure hunters are facing their greatest challenge yet.

The sun is shining in the Hundred Isles, and yet the path forward seems crowded with shadows. Conor, Abeke, Meilin, and Rollan have traveled across the world, seeking a set of powerful talismans in order to keep them from enemy hands. Throughout their journey the young heroes have been hounded by pursuers, who always seem to know just where to find them. Now they know why. One of them is a traitor.

The Aldens spend the summer on their own private island. There they meet a new friend with an amazing secret!...

When a group of adventurous friends stumbles upon a mysterious artifact , they are drawn into the age-old mysteries of the Sphinx . As they decipher cryptic riddles, hidden symbols, and ancient puzzles , they uncover a long-lost secret buried beneath the sands of Egypt. But danger lurks in the shadows—can they solve the final riddle before time runs out? Sphinx Riddle is a thrilling middle-grade adventure filled with history, mystery, and excitement , perfect for young explorers who love puzzles and ancient legends.

In the thirteenth book in Stuart Gibbs’s New York Times bestselling Spy School series, superspy middle schooler Ben Ripley goes off the grid to eliminate a cybersecurity threat. After a devious computer hacker pulls off the CIA’s worst-case scenario, shutting down power networks all over the...

A friend of Nancy Drew’s hopes to use her sleuthing skills to solve what seems to be a strange haunting at her aunt’s house! Hearing strange creaking, eerie thumps, and even music, the secretive mansion seems to be hiding something sinister. At the same time, Nancy’s father is warned of a...

Jules' family moves into an old abandoned house. Her parents love it, but she's frightened and feels a sense of foreboding. When she sees a pale face in an upstairs window, she can't stop wondering about the eerie presence on the top floor - in a room with a locked door. Her fear replaced by fascination, Jules becomes determined to make contact with the mysterious figure and to unlock the door. Past and present intersect as she and her ghostly friend discover the fate of the family who lived in the house all those many years ago. 

It’s nearly Katie’s birthday, and she learns she will be getting a special present. She’s too excited to wait patiently for the gift to arrive, so she decides to investigate ahead of time. The clues might lead her to her present, but is it better to let this mystery go unsolved?

Pedro and Katie are visiting Pedro’s Aunt Carmen’s farm. A frowning scarecrow has the kids spooked. Shadows and creepy sounds have Katie convinced that old scarecrow is haunted. But could there be another explanation?

Katie and Pedro are enjoying a night of camping, but when it gets dark, Katie feels nervous. Her dad tells her that it won’t be very dark for long. Why? It’s a mystery that will be revealed with time. What other discoveries will Katie and Pedro make during their wait to solve the mystery?

What's a contest without a prize? Aunt Molly has entered a joke-telling contest at a local comedy club, and Cam; her best friend, Eric; and Mr. Jansen are in the audience to watch her perform. The prizes are exciting, but the competition is stiff - there's a prop comic, a knock-knock joker, and more! As the show starts, Cam notices that one of the prizes, an engraved silver plate, has disappeared. Suddenly, everyone in the club becomes a suspect.

Summer camp is in full swing and Rebekah is on the lookout daily for a mystery that needs solving. Currently, she's obsessed with staking out the lake and the rumored monster that may live there. When she spots a lone canoe with something strange within it, her thoughts grow wild with ideas about what this could mean and how it is that the canoe keeps disappearing. 

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 Jr.: Sleuths on the...

Benny and Henry are working all summer at Furman’s, the biggest store in town, but they hadn’t expected that solving mysteries would be part of their job! When an expensive vase disappears, the salespeople receive odd notes, and the jewelry display is tampered with, it’s up to Benny to...

Meet Julian, Dick, Anne, George and Timothy. Together they are THE FAMOUS FIVE - Enid Blyton's most popular adventure series. Get ready for a Famous Five adventure with this audiobook of Enid Blyton's treasured classic, read by Mel Giedroyc. 'There was something else out on the sea by the rocks...

The clock has run out for thirteen-year-old Dan Cahill. As head of the most powerful family the world has ever known, he and his older sister, Amy, have been in the crosshairs for too long. Dan and Amy have always managed to stay a step ahead of their enemies, but it was only a matter of time until luck failed them. Now Dan is hopelessly trapped and nothing can save him. Nothing except unleashing an evil into the world even worse than the enemies closing in.