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Amy and Dan must steal a Clue guarded by thousands of the world’s best-trained soldiers. With their enemies closing in, the brother and sister are separated. Now how will they stand a chance?

Dear Diary.... I thought a trip to Nantucket with Bess and George would be a simple vacation, but of course mysteries seem to follow me everywhere! We're on this fun, end-of-summer trip because our friend, Jenna, has an awesome exhibit opening at the local Nantucket Nautical Museum, and we want to support her. She was really excited about it until some creep vandalized her welcome banner. Now it's become clear that someone is out to sabotage the whole exhibit.

Eight-year-old Nancy Drew and her friends enter a sand-castle-building contest. Someone doesn’t want them to win and won’t play fair. When their castle is destroyed, and a mean message is found in the sand, Nancy becomes a detective once again.

Nancy has a new puppy that needs lots of training, patience, and love. But when the chocolate-chip muffins go missing, Nancy’s new puppy is blamed. The girls know that the puppy is innocent, and they are determined to find the real thief.

Judy Moody is in a mood. A sleuthing, Nancy Drew kind of mood. So what’s a WBMS (world’s best mystery solver) to do? Go find a mystery, that’s what! And she doesn’t have to snoop for long: when Mr. Chips, a beloved crime-dog-in-training, goes missing, Judy Drewdy and her chums, agents Dills Pickle (Frank), Spuds Houdini (Rocky), and James Madagascar (Stink) find themselves smack-dab in the middle of a real-life, scare-your-pants-off whodunit. Was Mr. Chips stolen by dirty dognappers? And why are chocolate-chip cookies disappearing all over town?

It's a tough job, but somebody's got to do it. Guts, glory, danger, and sacrifice are all in a day's work for Hank the Cowdog, Head of Ranch Security. While investigating a murder on the ranch, Hank finds himself the number-one suspect.

Twelve-year-old criminal mastermind Artemis Fowl has discovered a world below ground of armed and dangerous—and extremely high-tech—fairies. He kidnaps one of them, Holly Short, and holds her for ransom in an effort to restore his family's fortune. But he may have underestimated the fairies' powers. Is he about to trigger a cross-species war?

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?

A lovable dog helps his human girl solve a mystery. Kayla and Mason both got mysterious letters, written in code. What does Kayla know? The same person left both letters. It's someone she and Mason both know. The two letters are the same, except for the second word. What does King know? Jillian left the letters. What do the letters say?

A lovable dog helps his human girl solve a mystery. Kayla made peanut butter treats for Jillian's new puppy, Thor. But now the treats are missing. What does Kayla know? There are three treats missing. King was in the kitchen. King's breath doesn't smell like peanut butter. What does King know? There's an intruder in the house. How will they solve the mystery?

A lovable dog helps his human girl solve a mystery. King and Kayla are playing fetch with their friends, Jillian and Thor. Jillian throws King’s favorite ball too hard, and now it’s gone missing! King and Kayla must put together the clues to figure out where it went - and who has it.

Never turn your back on the Cahills.... The most powerful family history has ever known returns with a vengeance in The 39 Clues: Doublecross! Confidential until August 2015!

Teddy Fitzroy's back for another zoo mystery this time it's a koala caper in this action-packed follow-up to Belly Up, which Kirkus Reviews called great fun. School troublemaker Vance Jessup thinks Teddy Fitzroy's home at Fun Jungle, a state-of-the-art zoo and theme park, is the perfect place for a cruel prank. Vance bullies Teddy into his scheme, but the plan goes terribly awry. Teddy sneaks into the koala exhibit to hide out until the chaos dies down.

When there's a bank robbery in the country village where Djuna lives, and one of his dog's best friends gets shot in the escape, the boy makes up his mind he'll find out who did it. His chum and his dog, Champ, are in on the hunt, and two heads and a keen nose are better than one. The boys remember something queer they noticed about a truck with a covered load that passed them on the road when they were going fishing.

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!

King, Kayla, and Grandma find a dog who has lost his human family. What does Kayla know? This dog doesn't have a collar or any tags. He can sit, lie down, and shake hands. No one around here knows who he is. What does King know? The dog's family is staying at a campground. Can they figure out who he is and where his family is?

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?

With a dad who disappeared years ago and a mother who's a bit too busy to parent, Emmy is shipped off to Wellsworth, a prestigious boarding school in England, where she's sure she won't fit in. But then she finds a box of mysterious medallions in the attic of her home - medallions that belonged to her father...who may have gone to Wellsworth.

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.

Jack's little sister, Susie, is so annoying! The Secret Seven are furious when they discover she's formed her own 'detective gang'! Then some money is stolen, and Susie is a chief suspect.