Gottie Oppenheimer, a seventeen-year-old physics prodigy, navigates grief, love, and disruptions in the space-time continuum in one very eventful summer.

Mya, Oliver, and Jorge don't know what they're going to do now that The Protector's HQ is destroyed and the evil Octavian has gotten away. They're no closer to finding their way home and aren't sure where to go now.

At nearly fifteen years of age, Joey Harker learns that he is a Walker, able to travel between dimensions, and soon joins a team of different versions of himself, each from another dimension, to fight the evil forces striving to conquer all the worlds.

As Arthur Penhaligon seeks to find the seventh key, complete his quest to save the Kingdom to which he is heir, and learn his true identity, he discovers that he has a greater purpose than he could have imagined.

Three ancient scrolls beckon high school student Aidan Thomas to enter a realm of knights, kings, and unusual creatures, but he must rely on instinct and his latent athletic ability to deal with the terror, tempest, and treason in this new world.

Jonah was able to save all of time from collapsing but in doing so gained a twin brother, Jordan, who must learn what has happened and do his own part to save time--and his parents.

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.

Kate, Michael, and Emma have passed from one orphanage to another in the ten years since their parents disappeared to protect them, but now they learn that they have special powers, a prophesied quest to find a magical book, and a fearsome enemy.

"When something crucial goes missing, eleven-year-old Olive and her friends must decide how to get it back--put their faith in a strange and dangerous magic, their odd new neighbors, or someone more uncertain and terrifying than both"--