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The Aldens have joined Dr. Iris Perez as she investigates legendary creatures around the world. In this adventure, the children travel to Iceland to look into stories of mischievous elves causing trouble. The legends of huldufolk, or hidden people, go back a long way in the country, but are elves really the cause of the problems, or is there a more natural explanation for the strange events on the island?​

The Aldens are spending their first week of summer at Camp Quest in Colorado. The children are excited to learn about fossil-hunting and paleontology from renowned scientist Dr. Iris Perez. But strange events at the camp make them wonder if the legends of a bigfoot-like creature roaming the valley might be more fact than fiction. Can the Aldens help Dr. Iris figure out who - or what - is causing such a stir?

Jessie wants her science fair project to make a difference. So when she gets the chance to test a local creek for pollution, she can't wait to get started. But when things start going wrong with her experiment, Jessie and her siblings don't just have an experiment to investigate, they have a mystery to solve!

The Aldens are visiting a small town known for its fall festival, and while Grandfather is off taking in the fall colors, the children try out the town's newest attraction - a Halloween escape room! The Aldens love solving the puzzles to get out of the room, and they don't mind the spooky theme. The problem is, someone - or something - is making things downright scary for other customers!

The Boxcar Children are helping a friend find out more about their family's history. But what they find is a mystery going back generations! Can the Aldens help their friend unlock secrets of the past - and present?

It's another day at the Swift Academy when Tom starts finding little troll-like figures around campus. And he's not the only one. Much to the amusement and curiosity of students, these dolls are appearing all over the school. But even after they're collected by faculty, a second wave mysteriously appears - except these replacements record audio and play it back for surrounding listeners. Before everyone knows it, secrets and gossip are revealed across campus, and suddenly the figures aren't nearly as fun as they used to be.

Every year, Swift Academy students go to a nearby summer camp to field-test their inventions. Tom and his friends have been working hard on all their projects, but they’re most thrilled about Noah’s new virtual reality simulation. They can’t wait for it to go live, and everyone is looking forward to running tests at the camp. Nothing dulls their excitement, not even when a mysterious prankster starts messing with people’s inventions.

Nancy, Bess, and George must find a stolen statue in this twentieth book of the Nancy Drew Diaries, a fresh approach to the classic mystery series. Nancy is beyond excited when she receives an invitation to an elite celebration of the arts hosted by the Duchess Strickland, a woman once renowned for her collection who hasn't been seen in years. With Bess and George at her side, Nancy's certain it will be an evening she’ll never forget.

When shelter cats Pasha and Poop move in with their new human family, they find themselves up against a ghostly bully. Scaredy Cat demands they follow his rules, or he'll cause all kinds of trouble - knock over lamps, spill kitty litter, and even get them shipped back to the animal shelter! But Pasha and Poop are stubborn and rebellious. They won't follow the Scaredy Cat's ridiculous rules like all of the other pets on the block.

A mysterious letter from an old friend asks Hal and Uncle Nat to help investigate a spooky supernatural mystery. Legend has it the Kratzensteins, a family of rich and powerful railway tycoons, are cursed, but there is no such thing as a curse, is there? Hal and Nat take the night train to Berlin and go undercover. From a creaking old house at the foot of the Harz mountains, they take the Kratzenstein family's funeral train to the peak of the Brocken Mountain. Can Hal uncover the secrets of the Brocken railway and the family curse before disaster strikes?

Harrison Beck and his Uncle Nat are on the journey of a lifetime aboard the Safari Star - a luxurious steam train that will take them from Pretoria to the stunning Victoria Falls. Close encounters with the amazing animals and landscape of Southern Africa are adventure enough, but things get mysterious when a passenger is found dead inside a locked compartment. Is it just a terrible accident, or is something more suspicious afoot? It’s up to train detective Hal and his new friend Winston to find out.

After the excitement of his adventures aboard the Highland Falcon Thief, Harrison Beck can't wait for the opportunity to go on another amazing train journey. So when his Uncle Nat invites him aboard the California Comet, the iconic three-day train journey from Chicago to San Francisco, he leaps at the chance to travel. But when the daughter of billionaire entrepreneur August Reza goes missing en route, Hal finds himself with another mystery to solve. Can he uncover the kidnapper before the journey's end?

September, 1939. When Jimmy is evacuated to a small village in Wales, it couldn’t be more different from London. Green, quiet and full of strangers, he instantly feels out of place. But then he finds a skull hidden in a tree, and suddenly the valley is more frightening than the war. Who can Jimmy trust? His brother is too little; his best friend has changed. Finding an ally in someone he never expects, they set out together to uncover the secrets that lie with the skull. What they discover will change Jimmy - and the village - forever.

Connor and Ethan are bamboozled when Starville, the space station where they live, is overrun with cosmic chaos! Boys have two heads, dogs have three tails, and even aliens who normally have six arms are growing extra ones! What is going on? Can Connor and Ethan get to the bottom of this intergalactic mystery?

Connor and Ethan are spending their summer holidays aboard the world's first orbiting city, Starville (basically Beverley Hills in space!). The amazing space station is bursting with celebrities and the mega-rich. But Connor and Ethan are too busy selling ice cream to see the sights.

Are you average? Normal? Forgettable? If so, The League of Unexceptional Children is for you! This first book in a hilarious new adventure series is for anyone who's struggled to be noticed in a sea of above-average overachievers. What is The League of Unexceptional Children? I'm glad you asked. You didn't ask? Well, you would have eventually and I hate to waste time. The League of Unexceptional Children is a covert network that uses the nation's most average, normal, and utterly unexceptional children as spies.

After their adventures in China and Germany, the Kidd family is ready for some rest and relaxation. But when you're an ace treasure hunting team, there's always another adventure waiting around the corner! This time the Kidds head to Russia, where a set of priceless paintings by Leonardo da Vinci and Rembrandt has gone missing. Hot on the trail of the daring thieves, the Kidds race through the sinister streets of St. Petersburg and the wild Arctic tundra to track down the stolen treasure.

Following his adventure on the California Comet, artist and amateur sleuth Hal Beck is looking forward to another railway journey with Nat, his journalist uncle - this time riding the historic Safari Star through South Africa. Then the already eventful journey becomes even more so when one of their fellow passengers dies on board!

After his adventure on the Highland Falcon, amateur sleuth Hal Beck is excited to embark on another journey with his journalist uncle. This time, they're set to ride the historic California Comet from Chicago to San Francisco. Hal mostly keeps to himself on the trip, feeling homesick and out of place in America. But he soon finds himself drawn into another mystery when the young daughter of a billionaire tech entrepreneur goes missing!

When 11-year-old Harrison "Hal" Beck is forced to accompany his travel-writer uncle on the last journey of a royal train, he expects a boring trip spent away from video games and children his age. But then Hal spots a girl who should not be on board, and he quickly makes friends with the stowaway, Lenny. Things get even more interesting when the royal prince and princess board for the last leg of the journey - because the princess' diamond necklace is soon stolen and replaced with a fake!