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A few months ago, Alex’s world changed...forever. Now, just when it seems life is almost getting back to normal, Alex’s grandfather crashes back into the picture with grave news: their friend Harry has fallen into the clutches of a familiar foe, and the old man needs Alex’s help to rescue him. This time, the duo’s desperate dash across Europe leads from Paris deep into Germany’s foreboding Black Forest, as they chase down the mystery Harry had been investigating when he disappeared.

Lucy, Max, Charlie and Joe aren't looking for new friends – they have too many of their own problems to worry about. But when the four of them, and Charlie's faithful dog, Sherlock, spot a phantom figure on Southwold beach one winter's night, they are thrown together to unravel a mystery that none of them expected. Just who is the ghostly spectre that walks the sands of Southwold with a lantern in his hand? What is the connection to the ancient curse that hangs over the town? And is the respectable Quentin De Havilland everything he pretends to be?

Shy girl Tom Ginger is the world’s unlikeliest hero – until she discovers that her new braces have the power to act as radio transmitters, allowing her to tune into the conversations of her new super-evil head teacher. Suddenly it’s up to Tom to save the school from Miss Fortune’s dastardly plans. Can she do it? Perfect for fans of Sam Copeland’s Charlie Changes into a Chicken and Danny Wallace's Hamish series.

Help Dink, Josh, and Ruth Rose solve mysteries from A to Z! This collection includes April Fools' Fiasco, Colossal Fossil, Grand Canyon Grab, and Space Shuttle Scam.

The New Year Dragon Dilemma: Dink, Josh, and Ruth Rose plan to watch the famous Chinese New Year parade. But during the parade, Miss Chinatown disappears, and so does her crown! The Castle Crime: Someone has stolen Queen Elizabeth’s jewels right outside Windsor Castle! The friends head to the castle for clues. Operation Orca: Dink, Josh, and Ruth Rose are on a whale-watching adventure. They see a mother orca and her calf. But the next day, the calf is missing! Secret Admirer: Dink, Josh, and Ruth Rose each start getting messages from a secret admirer.

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.

The hunt is on! Dink, Josh, and Ruth Rose are spending Thanksgiving in Plymouth, Massachusetts. They can't wait to see the sights and have a Thanksgiving dinner, just like the Pilgrims would have eaten. Then the kids learn about a sapphire necklace that went missing on the real Mayflower. Could the 400-year-old treasure be hidden somewhere nearby? And will someone else find it before they do?

It's sleepover night at a science museum in Boston. Dink, Josh, and Ruth Rose can't wait to settle their sleeping bags near the museum's colossal fossil - a giant Spinosaurus skeleton - and tour the exhibits long after closing time. But after they fall asleep, they wake to a terrible crash! Is the dinosaur fossil damaged? Or is there another big problem at the science museum?

Gina, Edgar, Elena, and Kevin have been best friends for as long as they can remember. So when their arch-nemesis points out that their initials make them literally GEEKs, they decide to go with it. The GEEKs’ hometown of Elmwood was once the headquarters of the famous toymaker Maxine Van Houten. Her popular puzzle sphere, the Bamboozler, put the town on the map. But Maxine passed away long ago. Now the toy factory is shutting down, and Elena’s mom and Kevin’s dad are losing their jobs. They might have to move—and that would mean splitting up the GEEKs!

After officially naming themselves the Petite Private Eyes, Peggy, Rita, and Dot are ready to take on a new assignment from the Lady Spies. The Fashion Twins, two local designers, have been robbed! When the girls go undercover to investigate, they find themselves joining a curious scout troop run by a mysterious scout leader. With the help of the Lady Spies and a feisty pet cheetah, will the girls crack the case and make some new friends?

When Holly and her family fly to LA for a holiday, it promises to be the trip of a lifetime. On her first day exploring the city of dreams, Holly befriends a movie director, who's captured something suspiciously dragonlike on camera while filming out in the desert. But before she can examine the tape properly, it goes missing.... Holly asks her partner-in-solving-crime, dragon detective Dirk Dilly, to join her on the hunt for clues in Hollywood. Will they be able to find the film before it falls into the wrong hands and exposes the existence of dragonkind to the world?

When a visitor turns up unannounced at Dirk's office with a new case for him and Holly to solve, all is not as it seems. A Sea Dragon has disappeared, and the only clue left at the scene of the crime is the ashy outline of an elusive Sky Dragon. As their investigations take them from a dodgy billionaire's HQ to the top of the city's tallest skyscraper, trouble is set to soar sky high for this dragon detective and his partner-in-solving-crime. Will they be able to hunt down the suspect and find the missing dragon before they both disappear into thin air?

Holly is desperate to be sleuthing with her partner-in-solving-crime, dragon Dirk Dilly, but instead she's stuck at her exclusive boarding school for children of the rich and famous. She's determined to escape, until she meets Callum, the son of the Prime Minister, who claims he was kidnapped by dragons a year ago and hasn't been the same since. And when Dirk's own investigation into dragon activity brings him to the school, the two cases collide. What if Callum isn't as crazy as he seems?

It's a dark and stormy night when three sleuthing little girls get pulled into a web of mystery. They have mistakenly uncovered a secret society of some of the most famous female spies in history. A glamorous spy named Josephine Baker enlists the girls to find out who has kidnapped Chiquita, her precious pet cheetah. Do the girls have what it takes to become spies themselves?

Willa and her clan are the last of the Faeran, an ancient race of forest people who have lived in the Great Smoky Mountains for as long as the trees have grown there. But as crews of newly arrived humans start cutting down great swaths of the forest she loves, Willa is helpless to stop them. How can she fight the destroyers of the forest and their powerful machines?

Everyone in Green Lawn is quaking about the ducks that keep crossing River Road. But just when the town raises enough cash to build a special duck bridge, the money is stolen! Dink, Josh, and Ruth Rose are on a quest to find the culprit.

Unlike most 12-year-olds, Maya Clayton is desperate to go to bed early. Falling asleep is the only chance she has to save her dad - the brilliant but slightly odd Professor Dexter. The professor invented a device that allows you to visit other people's dreams. But the devious Lilith Delamere has trapped him inside a nightmare, and Maya and the mysterious Dream Bandits must find a way to rescue him before it's too late! Maya will face a dangerous journey and some difficult choices. But sometimes all you need is a dream...and a bit of courage.

Maddie Robinson has always been overlooked: by her parents (who disappeared), by her friends (who are nonexistent), and even science fair judges (who think she has “so much...potential”). So when a mysterious man called The Recruiter invites her to join a secret society of spies, Maddie is floored. Then she discovers that these super secret super spies are the Illuminati - the world’s most covert organization rumored to control, well, everything. And one more thing: The Illuminati are kids, like Maddie!

It is 1884, and Molly and Cassandra Pepper, Emmett Lee, and Emmett’s long-lost father are sailing back to New York following their death-defying adventure in Antarctica. Having discovered a subterranean world at the South Pole while saving the world from certain doom once again, surely their accomplishments will finally earn them the recognition they deserve. Unless, of course...well, you know by now. And so do the Peppers and Lees.

Until their mother vanished, the Greystone kids - Chess, Emma, and Finn - knew nothing about the other world. Everything is different there. It’s a mirror image, except things are wrong. Evil. Their mother tried to fix it, but she and an ally got trapped there along with Ms. Morales, their friend Natalie’s mom. Now the four kids - brave Chess, smart Emma, kind Finn, and savvy Natalie - are determined to rescue everyone.