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Dink keeps getting envelopes in the mail addressed to "D. Duncan". But the letters inside all start with "Dear Doris" and don't make any sense! Josh and Ruth Rose think someone's playing a trick on Dink. But Dink is sure there's more to it than that, especially after Doris herself shows up and demands her letters!

When Cam and Eric go on a field trip to the museum with their fifth grade class, Cam - with her photographic memory - makes an interesting discovery: dinosaur bones are missing from one of the exhibits. When no one believes them, they decide to catch the thieves themselves. As they stake out the library, a mysterious milk truck stops by. Cam knows something is wrong. The logo on the truck does not match the logo on the milk carton they drank from at lunch. The game is afoot! Will they find the missing dinosaur bones when they follow the truck to a neighborhood house?

It is five days until Christmas, and Winston has a Very Curious Mystery to solve. He has hazy rememberings of another mouse, and he just knows that someone very important to him is lost. After promising Oliver that he will be back in time for Christmas, no matter what, Winston sets out on an exciting round-the-world adventure to find the missing mouse, helped along the way by wonderful old friends and delightful new ones, too.

Dink's favorite mystery writer, Wallis Wallace, has invited Dink, Josh, and Ruth Rose for a sleepover - in a haunted castle! But as soon as the young detectives arrive, they start hearing screams behind the walls. Will they discover who - or what - is haunting Moose Manor?

Abilene Tucker feels abandoned. Her father has put her on a train, sending her off to live with an old friend for the summer while he works a railroad job. Armed only with a few possessions and her list of universals, Abilene jumps off the train in Manifest, Kansas, aiming to learn about the boy her father once was. Having heard stories about Manifest, Abilene is disappointed to find that it's just a dried-up, worn-out old town. But her disappointment quickly turns to excitement when she discovers a hidden cigar box full of mementos.

Twelve-year-old Ben Ripley is not exactly the best student spy school has ever seen - he keeps flunking Advanced Self Preservation. But outside of class, Ben is pretty great at staying alive. His enemies have kidnapped him, shot at him, locked him in a room with a ticking time bomb, and even tried to blow him up with missiles. And he's survived every time. After all that unexpected success, the CIA has decided to activate Ben for real.

J is for Jewel.... New York is the emerald city! Dink’s uncle’s museum there has a new treasure - a golden jaguar statue with an emerald between its paws. But someone swaps the jewel for a fake! Who stole the jaguar’s jewel? Dink, Josh, and Ruth Rose are sure to find out!

Sometimes it takes a sleuth to catch a sleuth! Olivia Sharp, agent for secrets, always comes through to help those in need - especially her friends. But this time, Olivia is the one with a problem. Another detective is covering up her ads with those of E. J.'s Spy Service and spoiling Olivia's business. He's also trying to guess what weird feathery birthday present Olivia is hiding in her apartment. Can Olivia fool the sly spy?

Nate, the great detective, and his dog, Sludge, are off to San Francisco! They're going to visit Nate's cousin Olivia Sharp. She's a detective, too, and a very busy one. Olivia isn't around to solve her case number 22. Her client, Duncan, has lost his joke book. He tells Nate that if the book isn't found - and soon - the world will come to an end. Nate takes the case. He and Sludge cruise up and down and around San Francisco in the limo, tracking down clues. Sticky, icky clues, big and small clues, all-around-the-town clues that take them to a pancake house, over the Golden Gate Bridge, and finally to a place that seems wrong but could be right.

Ema Vašková has always felt different. In a family of famous scientists, there's not much room for superstition or omens—but they seem to follow Ema wherever she goes. It doesn't help that she appears to predict events before they happen, and has a peculiar fear of shadows. When Ema is sent to stay with her eccentric uncle in Prague, she fears she'll lose the chance to ever fit in. But then she meets Silvie—a girl who finally sees Ema for the extraordinary person that she is. Soon the girls are meeting for secret midnight adventures and facing Ema's fears together.

Nancy Drew’s dad surprises her with a trip to a beautiful New England ski resort for Christmas break. But no vacation can go smoothly when Nancy is involved. On her very first run down the slopes, Nancy hits a bad patch of ice and takes a serious tumble. A doctor sends her back to the hotel in a cast and mandates 12 days of bed rest. That means no long car trips back to River Heights and 12 days of sitting around. Luckily, there’s still the five-star dining and beautiful views. Just hours into her convalescence, Nancy witnesses something very suspicious.

There’s a bank robber in Green Lawn! A red-haired kid took a video of the crime, but nobody can find him. Without the video, will the robber go free? Dink, Josh, and Ruth Rose must track down that kid - before the bandit does!

It’s the height of summer in Moreland, and Grace Griffin and her fellow warden Tom Eely are sweltering in the heat until they answer a strange call for help that comes through on the amazing Griffin map. After teleporting to Oakwell, they find the town paralysed by a freezing snowstorm, which is ruining the famous summer market that brings in visitors and trade. Using their mystery-solving skills and amazing inventions, can Grace and Tom find the cause for the weird weather and restore summer from the snow?

Once Amy and Dan Cahill's choice was simple - take a million dollars or the first of 39 Clues that lead to the source of unimaginable power. Now it's clear that the hunt for Clues is bigger than anything that Amy and Dan could ever have imagined.

Help Dink, Josh, and Ruth Rose solve mysteries from A to Z! This collection includes Detective Camp, Mayflower Treasure Hunt, White House White-Out, and Sleepy Hollow Sleepover.

N is for Nugget...Dink, Josh, and Ruth Rose are spending a week at a dude ranch. Everything is normal in a cowboy kind of way - until Josh finds a huge gold nugget! Just as they are deciding what to do with their newfound riches, the nugget disappears. Will the kids be able to track down the thief before it's time to mosey on home?

Esmeralda came up with the perfect name for Rosamond's pet concert. But she lost the pink paper where she wrote the word - and she can't remember what it is. Nate the Great and his dog, Sludge, take on the unusual case, and they are soon braving pink papers and barking, oinking, and talking pets. Will Nate and Sludge find the word in time for the show to go on?

On Max's birthday, he finds a kind of magic mirror in the attic. It can make him invisible. So Max and his friends start playing "now you see me, now you don't." Until Max realizes that he's losing control. Staying invisible a little too long. Having a harder and harder time coming back. Getting invisible is turning into a very dangerous game. The next time Max gets invisible, will it be...forever?

When Josh discovers a nest of young falcons in the forest, he, Dink, and Ruth Rose start visiting every day. But in the morning they find it empty! The kids discover a wounded falcon with its wing feathers clipped, and they know someone's up to no good. Can they figure out what's going on before it's too late to save the falcons?

The time has arrived for Max and her winged "Flock" to face their ultimate enemy and discover their original purpose: to defeat the takeover of "Re-evolution", a sinister experiment to re-engineer a select population into a scientifically superior master race...and to terminate the rest. Max, Fang, Iggy, Nudge, Gasman, and Angel have always worked together to defeat the forces working against them—but can they save the world when they are torn apart, living in hiding and captivity, halfway across the globe from one another?