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Amy and Dan have managed to rescue one of the Cahills kidnapped by the Vespers, but the remaining hostages are still in peril. Their search for the next ransom item leads Amy and Dan to Turkey and then to Italy where a visit to the site of an ancient disaster changes everything. The Vespers are far more dangerous than the siblings ever imagined and, even worse, it looks like they have an undercover mole posing as a Cahill. Amy and Dan have to face the biggest decision of their lives with nowhere to turn... and no one to trust.

On the hunt for the 39 Clues, Amy and Dan Cahill uncovered shocking information about their past - from what happened the night their parents died to the shattering discovery of their family branch. Will Book Nine be the end of Amy and Dan? Or just the end of everything they think they know?

Dear Diary...Bess, George, and I are actually in Alaska! Everywhere you look, there are massive mountains and sparkling, deep-blue waters. We're on the maiden voyage of the Arctic Star luxury cruise ship, and my old friend, Becca Wright, the assistant cruise director, needs our help. She received threatening emails before even setting sail; then a bloody body turned up in the swimming pool.

This book was never meant to exist. No one needs to know the details. Just know this: there's a Merry, a Larry, a missing tooth, and a teachers' strike that is crippling Timmy Failure's academic future. Worst of all, Timmy is banned from detective work. It's a conspiracy of buffoons. He recorded everything in his private notebook, but then the manuscript was stolen. If this book gets out, he will be grounded for life. Or maybe longer. And will Timmy's mom really marry Doorman Dave.

A lovable dog helps his human girl solve a mystery. Kayla lost a tooth, but now it's missing! What does Kayla know? Her tooth is not inside the tooth fairy pillow. It's not inside her backpack. It's not inside the car. What does King know? Mason's hand smells like the tooth fairy pillow. How will they solve the mystery?

Ranofer struggles to thwart the plottings of his evil brother, Gebu, so he can become master goldsmith like their father. Young listeners will love this exciting tale of ancient Egyptian mystery and intrigue.

Steve likes to spend his mornings in the NCP village and trade his wheat for emeralds, armor, books, swords, and food. One morning, he finds that Zombies have attacked the villagers. The Zombies have also turned the village blacksmith into a Zombie, leaving Steve without a place to get swords. To protect himself and the few villagers that remain, Steve goes on a quest to mine for 40 diamonds, which are the most powerful mineral in the Overworld.

Only Joey Pignattano would agree to eat a worm in exchange for a dollar. Problem is, he doesn't trust Bobby Solofsky to hold up his end of the deal. So he's hired Jigsaw Jones and Mila Yeh to make sure Bobby keeps his word. But when the worm goes missing and the primary suspect is a mummy - on Halloween of all days! - Jigsaw Jones is the only one who can solve the case!

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?

The audio edition of the best-selling middle grade novel about a spunky girl born without arms and a boy with Tourette syndrome navigating the challenges of middle school, disability, and friendship - all while solving a mystery in a western theme park. Aven Green loves to tell people that she lost her arms in an alligator wrestling match, or a wildfire in Tanzania, but the truth is that she was born without them.

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.

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.