After being kidnapped by Mr. Chu, Atticus "Tick" Higginbottom and his friends Paul and Sofia must survive a series of tests in several different Realities.

When an all-consuming void from the Fourth Dimension opens up, unleashing monsters throughout the Realities, Mister George has one last weapon at his disposal--the mysterious and powerful Karma button, which might be even more dangerous than anyone imagined.

It's morning as usual at the Skidmore household, until Charles Lindbergh, the famous historical pilot, appears in their living room. Jonah can hardly believe his eyes, and then Lindbergh grabs Katherine and vanishes again. And that's not all. Chip, Andrea, and all the other children from the plane have disappeared too. And worst of all, Jonah's parents and all the other adults in his town have de-aged into children. Jonah is the only one left, and...

"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"--

Follows five young dreamers and outcasts through time and space, from 1453 Constantinople to the future, as they discover resourcefulness and hope amidst peril.

When Jonah and Katherine travel to early 1900s Switzerland and Serbia to return Albert Einstein's daughter, Lieserl, to history, her mother Mileva grasps entirely too much about time travel and has no intention of letting her daughter go.

A tale set in a world in which technological advances have been suppressed finds particle physicist Jon Grady helping to innovate a device capable of reflecting gravity only to be targeted by a shadowy organization from the future.

An unfulfilled college student hurtles through four parallel realities to explore the what-might've-been and the what-should-never-be in this Groundhog's Day-esque campus chronicle.

Fleeing to the U.S. border, Sitlati finds a conch shell detailed with ancient markings that connects her to Calizto, a young Aztec warrior in 1521 Tenochtitlan, and together they fight to survive--and for their love--across centuries.

Presents the continuing adventures of Henry York, who has been living in Kansas with his cousins, where he discovers doorways leading to other worlds and becomes involved in a multi-world struggle between good and evil.