When thirteen-year-olds Jonah and Chip, who are both adopted, learn they were discovered on a plane that appeared out of nowhere, full of babies with no adults on board, they realize that they have uncovered a mystery involving time travel and two opposing forces, each trying to repair the fabric of time

Twelve-year-old Zola, who has a surprising connection to Jessie, discovers that she is stuck in a fake utopian future, and that those around her are counting on her to help them escape. Twelve-year-old Zola thinks she has the perfect life. She thinks everyone does, now that it's 2193, and humanity has solved all its problems. Insta-Closets deliver new clothes every morning, Insta-Ovens deliver gourmet meals on demand, and virtual reality goggles...

Many surprises await twelve-year-old Edwy Watanaboneset when the Freds return him to Cursed Town, including that he has siblings in Refuge City who he will join in boarding school.

In the future, false identities, government lies and death threats keep Luke from being safe with his new identify when the younger brother of the boy whose name Luke has taken shows up at school

Time-travelers Jonah and Katherine are summoned to help another missing child from history, this time Virginia Dare from the Roanoke Colony, but their journey is sabotaged and goes dangerously awry, leaving them in the wrong time period. Includes author's note about the history of Roanoke Colony and Virginia Dare

Follows fifth grader Max as he searches for his best friend who disappeared, leaving behind a strange note.

Time travelers Jonah and Katherine arrive in 1611 to rescue missing child John Hudson, son of the explorer Henry Hudson, but just as the mutiny on the Discovery is supposed to start, Jonah and Katherine's knowledge of history is tested once again, and they fear that more is at stake than just one boy's life. Author's note includes facts about Henry Hudson's explorations

Jonah, Katherine, Chip, and Alex suddenly find themselves in 1483 at the Tower of London, where they discover that Chip and Alex are Prince Edward V and Richard of Shrewsbury, imprisoned by their uncle, King Richard III, but trying to repair history without knowing what is supposed to happen proves challenging. Author's note includes historical facts about the princes and king

Among the hidden: In a future where the Population Police enforce the law limiting a family to only two children, Luke has lived all his twelve years in isolation and fear on his family's farm. Then Luke discovers the existence of another shadow child and his world is turned upside down Among the imposters: Luke has the chance to come out of hiding at last. Under a fake identity, he is enrolled in the Hendricks School, where he discovers that there...

After returning the missing children from history to their original time periods, thirteen-year-old Jonah must save time itself when aviator Charles Lindbergh mysteriously appears and kidnaps Jonah's sister.