Books by Mary Pope Osborne

After a break from their trips in the tree house, Jack and Annie are delighted to find that it's back! Morgan le Fay needs their help, but they'll have to become Master Librarians first, and that means solving four riddles. For the first one, Morgan sends them deep into the middle of the ocean. Jack and Annie ride in a mini-sub and meet jellyfish, sea horses and an octopus. But there are some scary sharks in the deep and the friendly dolphins have to come to the rescue. . .

Eight-year-old Jack and his little sister, Annie, are playing in the woods when they find a mysterious tree house full of books. But these are no ordinary books . . . And this is no ordinary tree house . . .Jack and Annie might be on their scariest adventure yet - on the Amazon river! There are army ants, jaguars and piranas, as well as vampire bats, snakes and even crocodiles! And they've still got to find another clue to help rescue Morgan, the owner of the Magic Tree House. For a while, Jack and Annie are worried that they might be stuck in the rain forest for ever . . . But the over-active monkey they meet turns out to be friendlier than they first thought!

It's off to Ancient Greece for the children and the tree house ! They land just in time for the exciting Olympic Games, with the athletes, wrestlers and chariot racers all ready to go. But when Annie finds out no girls are allowed, there's trouble in store . . .

For this adventure, Jack and Annie are in Ancient China!When the tree house lands in ancient China, Jack and Annie are told to beware the fearsome emperor . . . It's not long before they learn the warning is right! In search of an old Chinese legend, they head to the palace of the dragon king. But he is not pleased to see them! And when they find themselves lost in his spooky burial grounds, only magic will help Jack and Annie escape!

Eight-year-old Jack and his little sister, Annie, are playing in the woods during their summer holiday, when they find a mysterious tree house full of books. But these are no ordinary books . . . And this is no ordinary tree house . . .Jack and Annie get more than they had bargined for when Jack opens a book about dinosaurs and wishes he could see them for real. They end up in prehistoric times with Pteranodons, Triceratops and a huge Tyrannosaurus Rex! How will they get home again? The race is on . . . !

Eight-year-old Jack and his little sister, Annie, are playing in the woods during their summer holiday, when they find a mysterious tree house full of books. But these are no ordinary books . . . And this is no ordinary tree house . . .Jack and Annie are whisked into the future - to an exciting outer-space hotel! But they've only got two hours before they run out of air . . . Will the mysterious moon man and his map help them get back safely?

Eight-year-old Jack and his little sister, Annie, are playing in the woods when they find a mysterious tree house full of books. But these are no ordinary books . . . And this is no ordinary tree house . . .Jack and Annie travel back in time, wearing only their swimsuits! When the tree house lands in the freezing Ice Age, they have to hide from hunters and escape from a great cave bear. But when Jack and Annie are chased by a fierce sabretooth tiger and fall into a hunting trap, they're really stuck. Will anybody come to their rescue?

Eight-year-old Jack and his little sister, Annie, are playing in the woods during their summer holiday, when they find a mysterious tree house full of books. But these are no ordinary books . . . And this is no ordinary tree house . . .Morgan le Fay - the owner of the Magic Tree House and all its mysterious books is missing and needs Jack and Annie's help! They follow her clues to Japan where they find themselves in the middle of a feud between Japanese ninja warriors and Samurai warlords. Will Jack and Annie find the tree house again? Or will they be caught up in a terrifying battle?

Eight-year-old Jack and his little sister, Annie, are playing in the woods during their summer holiday, when they find a mysterious tree house full of books. But these are no ordinary books . . . And this is no ordinary tree house . . .Jack and Annie are in a treasure trove full of trouble! Stuck on a desert island, captured by the evil Captain Bones and his gang and a huge storm at sea . . . For a while, it looks like they might not get home safely after all. And they discover that their adventures are even more magical than they had first thought . . .

Eight-year-old Jack and his little sister, Annie, are playing in the woods during their summer holiday, when they find a mysterious tree house full of books. But these are no ordinary books . . . And this is no ordinary tree house . . .When they're whisked away to ancient Egypt in the tree house, Jack and Annie learn how to read hieroglyphics with the help the ghostly Queen of the Nile.But secret codes aren't the only puzzle they have to solve. How do they get out of the pyramid full of mummies? And there's still the problem of who all these magical books belong to. Who is this mysterious M?

Eight-year-old Jack and his little sister, Annie, are playing in the woods during their summer holiday, when they find a mysterious tree house full of books. But these are no ordinary books . . . And this is no ordinary tree house . . .Jack and Annie find themselves on another adventure - this time they're in medieval England. It's exactly the same as the story book - there's a castle and a banquet and knights on horseback. But when they find themselves locked in a dungeon, Jack starts to wonder if they'll ever get home again . . .

A tale of high waves and high adventure for Jack and Annie when the tree house lands in the sea off the coast of Ireland. Things get dangerous when Viking ships approach!

Now master librarians, Jack and Annie are sent on a mission to find a lost story - in ancient Rome! It seems peaceful until the ground shakes and they realise they're there on the day that Mount Vesuvius erupts and they're in danger of being buried !

Jack and Annie are on very thin ice!Morgan Le Fay, the magical librarian, sends the children and the treehouse to the Arctic and tells them she'll send somebody to meet them there. But they're surrounded by ice and snow and there are huskies and polar bears all around them too - will they freeze to death first?