Found

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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.
AdoptionFictionScience fictionTime travelLarge type booksJuvenile fictionChildren's fictionAdoption, fictionTime travel, fictionAdventure and adventurers, fiction