Three young men are entrusted with the Imaginarium Geographica, an atlas of fantastical places to which they travel in hopes of defeating the Winter King, whose bid for power is related to the First World War raging in the Real World.

Readers can decide what happens in the plot by choosing different paths as they are presented, in this story about a student who is caught in a time machine.

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.

Polly's visit to her grandparents in Connecticut becomes an extraordinary experience as she encounters old friends and mysterious stangers and finds herself traveling back in time to play a crucial role in a prehistoric confrontation.

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

Cass finds herself alone and disoriented in a dream-like world, while back at home she is in the hospital in a coma with Max-Ernest desperately searching for a way to awaken her.

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.

A mysterious postcard leads Lisa and Nilly from Oslo to Paris in search of Doctor Proctor but, once there, all they find of their missing friend is a time-traveling bathtub powered by a special soap and several sinister individuals determined to do all they can to locate the eccentric inventor.

Stage fright on a summer night: 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. Good morning gorillas: The magic tree house takes Jack and Annie to an African rainforest, where the siblings encounter gorillas and learn to communicate with them. Thanksgiving on Thursday: Jack and Annie travel in their magic treehouse to the...

Jack and Annie are whisked back in time to the 1870s. They land on the prairie near a one-room schoolhouse, where they meet the teacher, some cool kids, and one scary bully. But the biggest and scariest thing is yet to come!