Eight-year-old Jack and his younger sister Annie use the magic treehouse to travel back to the Middle Ages, where they explore a castle and are helped by a mysterious knight.

Jack and Annie search for the fourth secret of greatness for Merlin the Magician in Mexico City at the 1970 World Cup Games where they hope to learn something new from soccer player great Pele.

A young girl relates the facts that are known about the unexplained disappearance of the crew on the ship Mary Celeste in 1872, and challenges the reader to solve the mystery.

In their magic treehouse, Jack and Annie are again transported to King Arthur's realm, where invisible beings, giant ravens, and mistaken magic spells have a duke's castle in an uproar on Halloween night.

The dramatic story of neighbors in a small Danish fishing village who, during the Holocaust, shelter a Jewish family waiting to be ferried to safety in Sweden.

Third graders travel through time to keep history on track! Abigail loves Mondays, and so does the rest of class 305. That's the day Mr. Caruthers asks them cool questions about history. Today Mr. C asks, "What if Abraham Lincoln never freed the slaves?" Abigail and her friends are ready to put their thinking caps on. But this time Mr. C wants them to do more than put their heads together-he wants them to travel back in time! Turns out the "What If?"...

Jack and Annie are whisked back in time to Old Philadelphia by the magic tree house to meet the Founding Father, journalist, and famous inventor Benjamin Franklin.

Brothers Willie and Taddie share stories about their father, Abraham Lincoln, focusing on the years they lived in the White House.

Jack and Annie travel in their magic tree house to Elizabethan London, where they become actors in a production of A Midsummer Night's Dream and try to rescue a tame bear.

In 1880, Noah's aunt teaches the reluctant nine-year-old how to read as they explore the Colorado prairie together, Noah pushing Aunt Dora in her wheelchair.