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

Ten-year-old Kara follows mysterious tracks in the snow that lead her across time and space from modern-day Sweden to 1942 Germany where two siblings are hiding from the Nazis.

"A boy goes on a long car ride to visit his grandmother and discovers time moves faster or slower depending on how bored he is"--

Having used their magic tree house to travel to India, where they must get a gift to help free the dog Teddy from a spell, Jack and Annie have adventures involving a tiger and other endangered jungle animals.

Tess de Sousa leaves Miss Ackerbee's orphanage to live with her new guardian in Roedeer Lodge, taking with her a fondness for scientific experimentation, a pet tarantula named Violet, and a device that allows her to travel to parallel universes.

"Frank Einstein (kid-genius, scientist, and inventor) and his best friend, Watson, along with Klink (a self-assembled artificial-intelligence entity) and Klank (a mostly self-assembled and artificial almost intelligence entity), once again find themselves in competition with T. Edison, their classmate and archrival, this time studying the science and mysteries of the universe!"--

Accompanied by her loyal friend Germ, twelve-year-old Rosie Oaks travels through time and space in a magical whale as she sets out to save her brother and fulfill her destiny to find and vanquish the remaining Thirteen Witches.

As her mother prepares to be a contestant on the 1970s television game show, "The $20,000 Pyramid," a twelve-year-old New York City girl tries to make sense of a series of mysterious notes received from an anonymous source that seems to defy the laws of time and space.

Fourteen-year-old Jason Walker is transported to a strange world called Lyrian, where he joins Rachel, who was also drawn there from our world, and a few rebels, to piece together the Word that can destroy the malicious wizard emperor, Surroth.

After Jason succeeds in finding a way back to Lyrian, he's immediately in more danger than ever. Meanwhile, Rachel and the others have made their own progress, as well as discovered new enemies. As the group ultimately rejoins, they strive to convince their most needed ally to join the war and form a rebellion strong enough to triumph against the emperor.