The Green Kingdom — Cornelia Funke

Caspia's summer is transformed when she discovers a bundle of letters containing ten plant-based riddles in this enchanting adventure for children ages 10 and up All right, she had to admit it: it really was an adventure to be in a new place. A different Caspia emerged here. A Brooklyn-Caspia, just like the Brooklyn-dandelion. Twelve-year-old Caspia hates big cities, especially New York. So, she isn't thrilled by the news that her parents are taking her to Brooklyn for the whole summer. But everything changes when Caspia discovers a bundle of letters, written by a blind girl many years ago, and hidden in an old chest of drawers. Each letter contains a 'green' riddle, with clues leading to a different plant. Caspia sets out to solve the riddles and, as she does, she meets friends she could never have imagined and finds, to her surprise, that sometimes you can put down roots where you least expect it.