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Jack and Annie are whisked all the way back to the Ice Age in this compelling Magic Tree House time-travel adventure, in which they meet woolly mammoths, cave people...and fierce sabertooth tigers!

Jack and Annie are whisked 40 years forward in time and land at an international space station on the moon. There they don space suits and go exploring the lunar surface in search of the fourth object needed to free the enchantress Morgan le Fay from a powerful spell.

Jack and Annie are off on another Merlin Mission. This time, Merlin has sent them to rescue a beautiful, magical creature, the unicorn. But when they land in New York City during the Depression of the 1930s, Jack and Annie are confused. Where will they find a unicorn in a big city? And what about the blizzard that's burying New York in snow? Can Jack and Annie make their way through the windy streets, find the unicorn, and maybe even bring some hope to the people of the great city?

"Where are the lions?" Jack wonders when the Magic Tree House whisks him and his sister to the vast plains of Africa. Before he can find out, Annie starts to help hundreds of wildebeests cross a rushing river. Next they follow a honey of a bird and meet an awesome Masai warrior. Jack hopes any lions will just stay away. Jack is about to be very disappointed.

A design process presents a series of steps, but in real life, it rarely plays out this neatly. Navigating Ambiguity underscores how the creative process isn’t formulaic. This book shows you how to surrender control by being adaptable, curious, and unbiased as well as resourceful, tenacious, and courageous.

When the magic tree house whisks Jack and Annie to a mountainside, they are surprised to find farmers nearby. Then they learn that the farmer's baby llama has been stolen, and Jack and Annie vow to bring the little animal back to its owners. But the journey is treacherous - they must climb to the peak of Machu Picchu and climb back down in order to complete this mission. Jack and Annie have been on many dangerous travels, but can they survive this one?

Make story time a little spookier with the number one best-selling chapter book series of all time! Every visit to the magic tree house leads to a time-travel adventure! Jack and Annie are on a mission to find - and inspire - a musician that brings happiness to millions of people. After traveling to New Orleans, Jack and Annie come head to head with some real ghosts, and discover the world of jazz when they meet a young Louis Armstrong.

The number one best-selling book series of all time celebrates 25 years with new covers and a new, easy-to-use numbering system! The magic tree house leads Jack and Annie to a tiny deserted island in the middle of the ocean. The brother and sister team are soon rescued by a ship of explorers and scientists who are looking for...a sea monster!

Jack and Annie are off in search of another story in jeopardy, this time at a monastery in ancient Ireland. Trouble arrives when Vikings land, and Jack and Annie must find a way to escape!

Beware of avalanches! When the magic tree house whisks Jack and Annie back in time to the highest pass in the Swiss Alps, they discover an ancient monastery filled with monks and Saint Bernard dogs. Annie can’t resist offering to train a wild young dog named Barry, but he is quite the handful! Before the night is over, Jack and Annie will be forced to use some crazy magic!

After months of travel, former maid Lottie Sprigg returns to Fortescue Manor in the rolling hills of Shropshire. Her arrival coincides with a celebratory dinner to mend a family feud. But the flow of champagne dwindles to a trickle when a body is found in the library. Who committed the atrocity? Suspicion falls on several characters: some above stairs and some below....

Merlin the Magician will not eat or sleep or speak to anyone in Camelot. What can be done? The enchantress Morgan knows who to ask for help: young Jack and Annie of Frog Creek, Pennsylvania! The brother-and-sister team quickly head off in the magic tree house on another magical and historical adventure.

The number one best-selling book series of all time celebrates 25 years with new covers and a new, easy-to-use numbering system! Merlin’s beloved penguin, Penny, has been put under a spell! To save her, Jack and Annie must find a rare and precious emerald. When the magic tree house whisks them back to India over four hundred years ago to search for the jewel, they discover an amazing and exotic world filled with great danger.

Jack and Annie travel back to the morning of the great San Francisco earthquake. While they are there, they meet a reporter and help get some kids to safety.

Jack and Annie head to 18th-century Austria, where they must find and help a musician by the name of Mozart. Decked out in the craziest outfits they’ve ever worn - including a wig for Jack and a giant hoopskirt for Annie! - the two siblings search an entire palace to no avail. Their hunt is further hampered by the appearance of a mischievous little boy who is determined to follow them everywhere. But when the boy lets the animals out of the palace zoo, Jack and Annie have to use the only magic at their disposal to save themselves and the naughty little fellow.

Jack and Annie are caught out in the rain in the most dangerous Magic Tree House mission yet! Jack and Annie are on a mission! When the magic tree house whisks them back to Galveston, Texas, in 1900, they find out that a big storm is coming. But even though there is rain and wind, no one believes there is any danger. As the storm grows, seawater floods the city. Now everyone needs help! Jack and Annie have a little bit of magic and a lot of hope - but will it be enough?

Jack and Annie are whisked back in time to the jungles of India, where they meet snakes and tigers, and find ancient ruins.

Jack and Annie are on their third mission to find (and inspire!) creative people to bring happiness to others through the arts (Mozart and Louis Armstrong so far). Set in Ireland, in this story Jack and Annie meet an Irish girl and go on a magical adventure that changes the girl's life. She grows up to be Lady Gregory, who helped bring back the Irish legends, started a theater, and helped the Irish people regain both their heritage and their pride.

Having survived sinister scarecrows and the malevolent smiling man in Small Spaces, newly minted best friends Ollie, Coco, and Brian are ready to spend a relaxing winter break skiing together with their parents at Mount Hemlock Resort. But when a snowstorm sets in, causing the power to flicker out and the cold to creep closer and closer, the three are forced to settle for hot chocolate and board games by the fire. Ollie, Coco, and Brian are determined to make the best of being snowed in, but odd things keep happening.

A powerful guide to why even the most well-intentioned innovations go haywire, and the surprising ways we can change course to create a more positive future, by two celebrated experts working at the intersection of design, technology, and learning at Stanford University’s acclaimed d.school.