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?

When Alice Mistlethwaite is shipped off to boarding school in Scotland, it's nothing like she imagines. Run by the mysterious Major, there are no punishments, and the students are more likely to be taught about body painting or extreme survival than maths or English! Then Alice's dad goes missing, and she must run away to find him. Can she persuade her new friends to help? So begins an epic quest across wild Scottish highlands and islands, where the children will face danger and excitement at every turn.

Be warned! Awful animals lurk inside. These 10 tales of the world’s craziest creatures will have you shaking with laughter. You’ll never look at pets in the same way again! Marvel at Houdini, the magician’s rabbit. Take a trip around the world with Zoom, the supersonic tortoise. Gasp at the chaos created by Griselda, a grizzly bear with a big secret. And run for your lives! It’s Furp, the monstrous goldfish!

Twitch has three pet chickens, four pigeons, swallows nesting in his bedroom and a passion for bird-spotting. On the first day of the summer holidays, he arrives at his secret birdwatching hide to find police everywhere: a convicted robber has broken out of prison and is hiding in Aves Wood. Can Twitch use his talents for bird-spotting to hunt for the dangerous prisoner and find the missing loot?

A mysterious curse has stricken Kexley Castle for generations ever since Egyptian treasure was transported to Cornwall by a 19th Century explorer. Can four young adventurers reveal the secrets that have been hidden for over a hundred years? Join Lara, Rufus, Tom, and Barney in their first exciting adventure together as they unravel the mystery and race to find Captain Jack Kexley’s hiding place.

All Tarquin Jenkins wanted to do was travel through space and time, solve some of the universe’s more pressing problems, and lay hands on the Nerydire Book of Dreams. Unfortunately, nobody told him about the bloodsucking Leche, the leprechauns, the other leprechauns, the killer androids, the extremely rude waitress, Nostradamus, Leonardo da Vinci, the malfunctioning toaster, the Zargothian legal system, the Bloated Shagganat nightclub, the psychopathic griddleback hordes, and a flame-haired, one-eyed space pirate called Georgia Blade.

Clara has lived a life of solitude, home schooled under her mean uncle's strict regime...until now! The day that Uncle abandons Clara, leaving her with nothing but a wedge of 'guilt money' and a half empty, crumbling manor house, she is determined to do things her way for a change. And when streetwise Peter turns up, with his rescue cat and a surprising array of knowledge, she is sure that between them they have everything they need to survive.  

My name is Ted Spark. Three months ago, I solved the mystery of how my cousin Salim disappeared from a pod on the London Eye. This is the story of my second mystery. This summer, I went on holiday to New York, to visit Aunt Gloria and Salim. While I was there, a painting was stolen from the Guggenheim Museum, where Aunt Gloria works. Then Aunt Gloria was blamed for the theft, and I realised just how important it was to find the painting and discover who really had taken it.

When 12-year-old Flick Hudson accidentally ends up in the Strangeworlds Travel Agency, she uncovers a fantastic secret: there are hundreds of other worlds just steps away from ours. All you have to do to visit them is jump into the right suitcase. Then Flick gets the invitation of a lifetime: join Strangeworlds' magical travel society and explore other worlds. But, unknown to Flick, the world at the very centre of it all, a city called Five Lights, is in danger. 

Penelope Magnificent's life doesn't live up to her name. Her dad thinks only about making money and her mum loves her handbag more than her daughter. But she gets through the hard times remembering the lovely French woman Perrine who looked after her when she was little. Even after Pear was sent away, she wrote to Nell every week, telling her about her new life. But then the letters stopped. So when Nell gets the chance to go to Paris with her parents, she is determined to track down Pear. But the mystery gets deeper when Pear isn't where she told Nell she'd be – and never had been!

Herbert Lemon, Lost-and-Founder at the Grand Nautilus Hotel, knows that returning lost things to their rightful owners is not easy - especially when the lost thing is not a thing at all, but a girl. No one knows what happened to Violet Parma’s parents 12 years ago, and when she engages Herbie to help her find them, the pair discover that their disappearance might have something to do with the legendary sea-monster, the Malamander. Eerie-on-Sea has always been a mysteriously chilling place, where strange stories seem to wash up. And it just got stranger....

Eleven-year-old Casper Tock hates risks, is allergic to adventures and shudders at the thought of unpredictable events. So, it comes as a nasty shock to him when he accidentally stumbles into Rumblestar, an Unmapped Kingdom full of magical beasts. All Casper wants is to find a way home, but Rumblestar is in trouble. An evil harpy called Morg is sending her followers, the Midnights, into the kingdom to wreak havoc and pave the way for her to steal the Unmapped magic for herself.

Cordelia comes from a long line of magical milliners, who weave alchemy and enchantment into every hat. In Cordelia's world, Making - crafting items such as hats, cloaks, watches, boots and gloves from magical ingredients - is a rare and ancient skill, and only a few special Maker families remain.

Previously published as Sisters of Fortune. Sophie and Rosa Moran are born into a working-class family struggling to rise above poverty. Their father is a lowly employee at Thackreys' Bank, a powerful family-run concern. Sophie and her sister first come into contact with the Thackrey family - especially young Lydia - as children through their father's job. In spite of the social differences between them, they form an enduring friendship.

When Arthur and Rose were little, they were heroes in the Land of Roar, an imaginary world that they found by climbing through the folding bed in their grandad’s attic. Roar was filled with things they loved - dragons, mermaids, ninja wizards and adventure - as well as things that scared them (including a very creepy scarecrow).... Now the twins are 11, Roar is just a memory. But when they help Grandad clean out the attic, Arthur is horrified as Grandad is pulled into the folding bed and vanishes. Is he playing a joke? Or is Roar...real?