Jack and Annie are joined by Teddy and Kathleen as they travel to the snowy Land-Behind-the-Clouds, where they search for the eye of the Ice Wizard and attempt to help Merlin and Morgan.

"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!"-- Provided by publisher.

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.

"Somewhere in this world there is a small hill, where three girls are taking off their shoes. But many thousands of years ago, a dinosaur saw a brilliant star falling as he stood on that same hill. The ice age comes and goes, castles are built and fall into ruin. The world grows and changes around the hill: trees are planted, a family seeks refuge, and houses are built below it. Now it’s time for the girls to put their shoes back on and go home."--...

Jason and Rachel's adventures and friendships have made Lyrian more of a home to them than they could have imagined, so now, armed with the prophecy of a dying oracle, they are ready to become Lyrian's heroes whatever the cost to themselves.

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.

When Bertie Wells accidentally creates a black hole in his bedroom in the year 1878, it's the very last thing he expects-except maybe the grown-up who steps out. Darla Marconi dresses and speaks like no one Bertie has met and comes with an offer: Bertie is invited to attend the College of Space Machines, Multiverses, and Other Odd Sciences (COSMOS for short, because no one would go to a school called COSMMOOS). He is skeptical to say the least but,...

During a summer holiday in Wales, Portia and Ben discover a mysterious door in a forest, unaware that it is a portal to a perilous Otherworld, and they unwittingly open the door, unleashing a powerful evil that endangers both the human and fairy realms, forcing them to confront the consequences of their actions.