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Someone's been stealing from the lost and found. But the strangest part of this mystery is what they've been stealing. Not mittens, or books, or water bottles - only hats! Just when Jigsaw comes up with a plan to catch this hat burglar in the act, the mystery thief strikes again right under his nose! Will this be the first case Jigsaw and Mila can't solve?

Why would anyone steal an old hunk of junk? Ralphie Jordan loves his beat-up bike, Old Rusty. The tires are bent, spokes are missing, and the chain keeps falling off. But Ralphie wouldn't trade it for any other. Then Old Rusty goes missing just outside the library, and Ralphie is devastated. It's up to Jigsaw and Mila to find out who stole it - and the thief may be closer than anyone would have guessed!

Got a mystery to solve? Jigsaw Jones is on the case. Anything that ever goes missing or lost, Jigsaw and his partner, Mila, can find. Then, during a magic show, they watch a toy dinosaur disappear, right in front of their eyes! Even the magician can't seem to bring it back. Luckily Jigsaw doesn't believe in magic, and he's determined to find that dinosaur!

In Robo-Dodo Rumble, Koko Dodo's cookie shop is facing some stiff competition from an evil robotic dodo (a Robo Dodo). The Robo Dodo is selling its cookies for only a penny! Why? To put Koko's shop out of business! And if that weren't bad enough, a giant sea monster starts destroying the town! But don't worry. Didi Dodo has a daring plan.

Didi Dodo, the heroic spy, and Koko Dodo, the cookie chef, are off to solve another kooky caper! In Double-O Dodo, Koko has a big problem: His trusty assistant, the Queen, has been kidnapped! Over a frantic phone call, she tells Koko that she’s been kidnapped by a human, which is preposterous - everyone knows that humans aren’t real! Luckily, Didi is on the case. Her plan: To go undercover at the Humanland amusement park to find the Queen.

Judy Moody is in a royal purple-mountain-majesties mood. Make that Majesty with a capital M! With Grandma Lou’s help, Judy has dug up proof that some old-timey Moodys (aka the brave Mudeyes) lived in merry olde England. In fact, if her grandpa’s notes are right, Judy might even be related to - royal fanfare, please - the Queen herself! Should Judy start packing her purple robe for a sleepover at Buckingham Palace?

In the sixth book in the number-one best-selling Alex Rider series by Anthony Horowitz, teenage spy Alex has a chance encounter with the son of multi-billionaire Nikolei Drevin. Soon Alex finds himself in the middle of an international crime hunt. The connection - Ark Angel, a revolutionary space hotel with catastrophic potential.

The third, explosive mission in the number one best-selling Alex Rider series. In the third book in the number one best-selling Alex Rider series by Anthony Horowitz, teenage spy Alex faces his most dangerous challenge yet. Teaming up with the CIA, Alex must go to a remote Caribbean island called Skeleton Key, where the insane general Sarov is hatching explosive plans to rewrite history.

Though I, Timmy Failure, have solved many notorious crimes and now wish to enjoy my retirement, my fans have begged me to turn my memoirs into a movie, an ode to my greatness. I am, however, beset by enemies, the worst of whom is Tom John John, the buffoonish movie director. What’s more, my father is in town, working at a bar, which is obviously just a cover for our father-son crime-fighting partnership. And my dimwitted polar bear business partner, Total, wants to be reunited with his family.

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?

When Nick and Tesla Holt are sent to live with their eccentric Uncle Newt, they find their new neighborhood is full of secrets. What the heck is going on? To unravel the mysteries (and save their skins), Nick and Tesla must use everyday household objects to build electromagnets, rocket launchers, and other crazy contraptions.

When 11-year-old Annie first started lying to her social worker, she had been taught by an expert: Gran. "If you’re going to do something, make sure you do it with excellence," Gran would say. That was when Gran was feeling talkative, and not brooding for days in her room - as she did after telling Annie and her little brother, Rew, the one thing they know about their father: that he was killed in a fight with an angry man who was sent away.

Jimmy Stoker's dreams have been full of tigers since he started his Saturday job at the zoo. Boris, the great Siberian tiger, has died and rumours abound about what's going to happen to him now. Jimmy hears that someone wants to steal Boris's bones, because tiger bones reputedly have healing powers and fetch a lot of money on the black market. So when he sees the tiger being smuggled out of the zoo, he fears the worst. With the help of his schoolmate Billy and his old friend Major Gregory, Jimmy is determined to investigate.

Twelve-year-old Amy knows there's some connection between Aunt Claire's old dollhouse in her great-grandparents' attic and a deadly family secret from years ago. Aunt Claire seems upset about the dollhouse, which is a replica of the house they're in, but she's not talking.

Nobody wants to adopt the Shluffmuffin twins. Wally's feet stink something awful, and Cheyenne is allergic to everything. Then why are the Mandible sisters so eager to take them home? And what sort of old maids would choose to live in a place called Dripping Fang Forest, where zombies wander the woods singing "Itsy Bitsy Spider" and 10-foot-long glowing slugs want to suck the feet right off your ankles?

In 11 Birthdays, Amanda and her best friend, Leo, stopped speaking to each other for a year. What happened when they started talking again led to the adventure of a lifetime. Now they haven't spoken for another year - and the result is even more bizarre. This time it's not just about them. Their friend's little sister, Grace, has fallen into a strange frozen state on her tenth birthday. Amanda and Leo quickly realize that Angelina D'Angelo - the mysterious old woman behind all of the magical happenings in Willow Falls - is involved.

Olivia Sharp, cousin to super sleuth Nate the Great, is a detective too! Rather than solve mysteries like Nate, Olivia helps friends with their problems by detecting what's wrong beneath the surface. You'll be won over by Olivia's spunk, eccentricities, and can-do spirit. Olivia Sharp is one smart agent for secrets - which means she knows how to read between the lines. Olivia's best friend, Taffy Plimpton, has a problem. Taffy wants to join a secret club, but its members won't let her in. Why not? It's a secret that Olivia is determined to find out!

When seventh grader Georges (the S is silent) moves into a Brooklyn apartment building, he meets Safer, a 12-year-old coffee-drinking loner and self-appointed spy. Georges becomes Safer's first spy recruit. His assignment? Tracking the mysterious Mr. X, who lives in the apartment upstairs. But as Safer becomes more demanding, Georges starts to wonder: how far is too far to go for your only friend? Liar & Spy is an inspired, often-funny story about destiny, goofy brilliance, and courage.

Perfect for young listeners, this timeless audiobook is a fun introduction to the detective mystery genre. And for Valentine's Day, kids can follow Nate as he unravels the problem, all the while learning about the importance of friendship - with people and dogs! Nate the Great hates mushy stuff. Then he spies a big red paper heart taped to Sludge’s doghouse. Who left Nate’s dog a secret valentine? Nate will solve the case, and then there will be no more mushy stuff. At least that’s what he thinks...

These audiobooks introduce young listeners to the detective mystery genre. Perfect for the Common Core, kids can problem-solve with Nate, using logical thinking to solve mysteries! Nate the Great is about to enter his dog, Sludge, in the smartest pet contest. But when the prize disappears, it looks as if the contest will flop. It's a tough case for Nate and Sludge as they search for clues leading to the missing prize. In more ways than one, it's a very fishy business. Can Nate and Sludge find the prize in time?