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Jack might be the only kid in the world who's dreading summer. But he's got a good reason: summer is when his single mom takes a second job and leaves him at home to watch his autistic kid sister, Maddy. It's a lot of responsibility, and it's boring, too, because Maddy doesn't talk. Ever. But then, one day at the flea market, Maddy does talk -- to tell Jack to trade their mom's car for a box of mysterious seeds. It's the best mistake Jack has ever made.In Mighty Jack, what starts as a normal little garden out back behind the house quickly grows up into a wild, magical jungle with tiny onion babies running amok, huge, pink pumpkins that bite, and, on one moonlit night that changes everything ... a dragon.