Dark Day in the Deep Sea

Jack and Annie continue their quest for the secrets of happiness - secrets they need to save Merlin. This time, the Magic Tree House takes them to the one continent they haven't visited before: Antarctica! What can they hope to learn about happiness in such a barren place? Only the penguins know for sure.... Jack and Annie are about to find out!

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!

Jack and Annie are on their second mission to find and inspire artists to bring happiness to millions. 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.

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?

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.

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.

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. Will Barry lead Jack and Annie to the mysterious flower they need to save a friend's life? Or will he only lead them into danger?

A mysterious note from Merlin sends Jack and Annie to Paris, France, for the 1889 World's Fair. Their mission: find four "new magicians" and protect them from an evil sorcerer who plans to kidnap them and steal the secrets of their magic. When Jack and Annie arrive at the foot of the Eiffel Tower, they find exhibits from all over the world and thousands of people attending the fair!

Merlin's beloved penguin, Penny, has been put under a spell! Jack and Annie must find four things to break the spell. The first is a rare and precious emerald. When the magic tree house whisks them back to India over 400 years ago to search for the jewel, they discover an amazing and exotic world filled with great danger. Will Jack and Annie find what they're looking for? Will they avoid the wrath of the all-powerful Great Mogul, survive a crazy ride on a wild elephant, escape an attack by king cobras - and make it back to the magic tree house alive?

In this new Merlin Mission, Jack and Annie travel to Venice during Carnival time. Their mission: Save the Grand Lady of the Lagoon!

Jack and Annie, joined by Teddy and Kathleen (from earlier books), travel in the Magic Tree House to a land of snow where the Ice Wizard has captured Morgan and Merlin. The four friends must find the Ice Wizard's missing eye...or is it really his heart that is missing?

Jack and Annie are off on another mythical mission at the request of Merlin the magician. Luckily they have a young sorcerer, Teddy, to help them. From underwater caves to a Spider Queen, from mystical "selkies" to a magical sword, this is a Magic Tree House adventure kids won't want to miss!

When Teddy, a young sorcerer, offers to send Jack and Annie on a dream vacation, they can't wait to go. The brother-and-sister pair wish for a trip to a beach paradise, and the magic tree house whisks them off to the coast of Mexico. Everything starts out perfectly as they raft around a coral reef. But then a hungry shark attacks! And their dream vacation turns into a nightmare!

Magic Tree House #51: High Time for Heroes features Jack and Annie back in Egypt, still seeking the secrets of greatness for Merlin. This time they will meet the great nurse, Florence Nightingale, on her trip to Egypt that served as the inspiration for the choices that made her both famous and beloved.

The magic tree house has returned, and it's taking Jack and Annie back in time to Alaska, 1925. There they meet Balto, a jet-black Siberian husky destined to save victims of the diphtheria epidemic. But the trail isn't easy, and Balto is going to need Jack and Annie's help!