Meg Murry and her friends become involved with unearthly strangers and a search for Meg's father, who has disappeared while engaged in secret work for the government.

Jack and Annie are transported by their magic tree house to the time of the Civil War where they meet Clara Barton.

Artemis's fairy friends help him travel back in time to find a cure for his mother's rare disease which can only be cured by the brain fluid of now-extinct African lemurs, and is shocked to discover that it was actually his younger self who was responsible for bringing about the animal's extinction.

The magic tree house takes Jack and Annie to San Francisco in 1906, in time for them to experience one of the biggest earthquakes the United States had ever known.

Jack and Annie travel to a monastery in the Swiss Alps where, with the help of St. Bernard dogs and magic, they seek the second of four special objects necessary to break the spell on the wizard Merlin's beloved penguin, Penny.

Molly Moon, reunited with her parents, is hypnotized by a mysterious turbaned gardener and eventually transported to India, where she meets not only a maharajah with a speech defect but also former versions of herself.

"In this illustrated novel for middle-grade readers, Billy Stuart and his loyal Scout group have inadvertently traveled through time and have to cross an ocean full of danger."--

Patrick and his cousin Beth travel back in time to ancient Rome, where they meet Telemachus and help put an end to the spectacle of gladiators fighting to the death.

Pulled through a glass that brings him back in time, Septimus Heap becomes the apprentice of an alchemist.

The magic tree house whisks Jack and Annie to Washington D.C. in the 1860s where they meet Abraham Lincoln and collect a feather that will help break a magic spell.