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Jack and Annie know they have to search for one of the four secrets of happiness to help Merlin the magician find joy in his life again. And so they head off in the magic tree house for Florence, Italy, in the early 1500s to spend the day with one of the greatest artists and inventors of all time: Leonardo da Vinci!

For the Tenth Doctor, the festive season always brought adventure. In fact, he's saved Christmas across space and time more times than we ever knew. Join the Doctor (and Donna and Martha and Rose, and other friends old and new) for incredible tales of daring and danger. From Daleks plotting to save humanity to Sycorax working to exploit it...from star-narwhals massing on the Moon to a toy factory in space. Because even in the jolliest of seasons there's a world or two to save.

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?

Time travel. It’s a concept that has fascinated curious minds for centuries. The idea of stepping into a different era, a different world, where the rules are unfamiliar and the possibilities endless—it’s the kind of adventure that fills the imagination. But what makes time travel even more exciting isn’t just the chance to see the past or future—the challenges that come with it.

From #1 New York Times bestselling Sisterhood of the Traveling Pants author Ann Brashares and her brother Ben Brashares comes the second book in the action-packed middle grade alternate history thriller trilogy that asks what present-day America would be like if Germany had won World War II.

In the concluding book of the Mount Emily series, Patsy and Elena are now in Secondary Four and face having to leave Mount Emily Girls' School by the end of the year. However, they soon find that graduating from their beloved school is the least of their concerns, as unexpected circumstances lead them to have a final showdown with the Midnight Warriors, and in so doing, change the course of time travel forever.

Jodie lives in the year 2075, and more than 50 years have passed since the banning of books and paper; it's a time when no one can own a printed book. In this E-world, experiences are largely simulated, from the reconstituted food, to the zoo that only shows films of all the extinct species. With her student library card, which gives her the ability to time travel, Jodie discovers that she and her friends can experience historical events and meet legendary characters, and can also find and bring home her precious books to keep safe in her secret hiding place.

Liam Chapman cannot believe his good fortune. He just bought a real, working time machine at a garage sale for $3. Sure, it’s labeled “World’s Worst Time Machine,” but how bad could it be? The time machine, as it turns out, is so much worse than Liam could have imagined. First, it summons Thomas Edison, but not that Thomas Edison. This Thomas Edison is a 10-year-old aspiring gangster from 1933 who demands to be called “Tommy Twinkles” and is also very interested in robbing a bank of the future.

In Night of the Ninjas, Jack and Annie meet a real live ninja when the Magic Tree House whisks them back to ancient Japan in search of enchantress Morgan le Fay, who holds the answer to the origins of the Tree House. When they arrive, they find themselves in the cave of a ninja master. Will they learn the secrets of the ninja? Or will the evil samurai warriors get them first?

Hello! It's me, Ruby Thumb. Me and my dad have loads of amazing adventures in Dinotropolis - an incredible island, full of dinosaurs who live just like us humans do. And when we go there using our special magic ammonite shell, we turn into dinosaurs too! Let me tell you about the time I spent the week at Pangea’s Largest Outstanding Prehistoric School - or PLOPS, as we call it, ha! - AND took part in the Big Dino Talent Show. It was totally roarsome, but there were a few dino-tastic surprises along the way...

Twins Pearl and Patrick are no ordinary twelve-year-olds. They’re geniuses, hiding in plain sight, who pull heists all over the world to further their scientific and historical research. Their criminal activity, including grand theft auto, B&E and even espionage, have made them a regular nuisance to both the CIA and MI6. But it’s all been worth it. They’ve finally achieved their greatest triumph: time travel. Pearl’s Chrono-Loop can take the twins anywhere! Their first stop ancient: Egypt where they even get to see King Tut!

Regan Fitz and Elliot Mason have been enemies since they started training to become Glitchers - people who travel through time to preserve important historical events. But everything changes when they find a letter from Regan’s future self, warning them about an impending disaster that threatens them and everyone they know.

Liam O’Connor should have died at sea in 1912. Maddy Carter should have died on a plane in 2010. Sal Vikram should have died in a fire in 2026. But all three have been given a second chance - to work for an agency that no one knows exists. Its purpose: to prevent time travel destroying history.....

Liam O'Connor should have died at sea in 1912. Maddy Carter should have died on a plane in 2010. Sal Vikram should have died in a fire in 2026. But all three have been given a second chance - to work for an agency that no one knows exists. Its purpose: to prevent time travel destroying history... A time wave has struck that alters the entire history of the American Civil War. Abraham Lincoln has followed Liam into the present from 1831 - and now the world is in a dangerous state of limbo.... If the TimeRiders can't return Lincoln to the past, the Civil War will never end.

The Magic Tree House whisks Jack and Annie away to the decks of that ill-fated ship, the Titanic. There, they must help two children find their way to a lifeboat, all while they are in danger of becoming victims of that tragic night themselves.

In honor of Madeleine L'Engle's 100th birthday, fans are invited to enjoy this archival audiobook, originally recorded in 1993 and newly restored! Listen to the voice of the author as Madeleine L'Engle reads her Newbery Medal-winning novel A Wrinkle in Time.

Orphans Pew and Basket Church managed to escape (barely) the clutches of time’s greatest villain and dash his hopes of world domination (he didn’t take too kindly to that). Even more shocking than discovering they can travel through time (and have a mission to protect it)? It turns out the Church family treasure their enigmatic time-traveling parents left behind is actually a long-lost, much-wished for relative. The twins follow clues and riddles to Ancient Egypt—and land right in the middle of a deadly power struggle between Cleopatra and her brother, Ptolemy.

Travel back in time in the magic tree house with Jack and Annie in this number one best-selling series, and meet the greatest warriors of all - the Romans! Then get whisked away and meet famous founding-father and inventor Ben Franklin!

When Great-Uncle Thorne arrives at Elm Medona, Maisie and Felix's lives get shaken up again. Uncle Thorne moves the family into the mansion proper. One night, Great-Aunt Maisie arranges for Thorne, Maisie, and Felix to rendezvous with her in The Treasure Chest. Minutes later, Maisie and Felix find themselves at a magic show on Coney Island in 1893 starring Harry Houdini.

The Time-Traveling Toys is an exciting and imaginative adventure where toys come to life and embark on thrilling journeys through time with their best friend, Riley. When they stumble upon a mysterious time machine in an old attic, they are transported to different eras, from ancient castles to futuristic cities, meeting incredible characters and exploring magical lands.