Twelve-year-old twins Nick and Eryn and their robot stepsiblings, Jackson and Ava, try to save humanity from killer robots.

Still reeling from their experiences in Roanoke in 1600, Jonah and Katherine arrive in 1611 only moments before a mutiny on Henry Hudson's ship in the icy waters of James Bay. But things are messed up: They've lost the real John Hudson, and they find what seems to be the fabled Northwest Passageeven though they are pretty sure that route doesn't actually exist. Will this new version of history replace everything they've ever known? Is this the end...

A sympathetic teacher and her writing assignment help fourth-grader Dexter deal with being the new kid in school after he punches a kid on the first day.

Melly and Anny Beth agree to participate in Project Turnabout, a scientific experiment in which they are given a shot that will make them grow younger, until they receive a second injection that will stop the aging process, but when other participants die after receiving the second shot, Melly and Anny Beth refuse to have the shot and set out to find someone to care for them when they are too young to do it themselves.

A sixteen-year-old boy arranges a housesitting job for the summer, but he starts acting strangely after his family moves in, and his sister begins to suspect they are not supposed to be there.

After joining her new friends in the religious group called Fishers of Men, Dorry finds herself immersed in a cult from which she must struggle to extricate herself.

In a future where the law limits a family to only two children, third-born Luke has been hiding for the entire twelve years of his life, until he enters a boarding school under an assumed name and is forced to face his fears.

After her father is convicted of embezzlement, Becca Jones, fourteen, and her mother flee Georgia for small-town Ohio but three years later she learns that his misdeeds may have jeopardized not just her future but also her life.

While investigating a series of old, spooky photos of a seemingly transparent boy for their friend Ree, who lives above a funeral home, best friends Colin and Neveah follow the clues to solve this mystery from the Great Depression.

"It isn't natural for you to be younger than your great-grandchildren. We messed around with nature, and we shouldn't have. Melly and Anny Beth both lived normal lives throughout the 20th century. But in 2000, when they are old and ready to die, they are selected to participate in Project Turnabout and are given an injection to make them grow younger..."