Eight-year-old Jack and his younger sister Annie find a magic treehouse. Each book in the collection takes them to different places.

Tonight on the Titanic: The magic tree house transports Jack and Annie to the deck of the Titanic to find a mysterious gift that will free a small dog from a magic spell. Buffalo before breakfast: The magic tree house takes Jack and his sister Annie to the Great Plains where they learn about the life of the Lakota Indians. Tigers at twilight: Having used their magic tree house to travel to India, where they must get a gift to help free the dog Teddy...

"Jack and Annie are magically transported to mid-1800's Thebes where they are saved from a dangerous accident by Florence Nightingale!"--

"Jack and Annie use the magic tree house to travel back in time to 1947 Brooklyn, New York, where they pretend to be batboys at Jackie Robinson's first game with the Brooklyn Dodgers against the Boston Braves"--

Carnival at candlelight: Merlin has asked Jack and Annie to help on another Merlin Mission. This time they head back into history to Venice, Italy, in the 1700s. With the help of some new friends, a research book, and a mysterious rhyme from Merlin, the heroes will save the beautiful city from a flood! Season of the sandstorms: Armed only with a research book and a book of magic rhymes, Jack and Annie to back 1,200 years to the Golden Age of Baghdad....

Their magic tree house takes Jack and Annie back to retrieve a lost story in ancient Greece, where they witness the original Olympic games and are surprised to find what girls of the time were not allowed to do.