This New York Times bestselling modern classic explores the perennial topic of environmentalism in an urban world, from the creator of The Wild Robot and Mr. Tiger Goes Wild One boy's quest for a greener world... one garden at a time. While out exploring one day, a little boy named Liam discovers a struggling garden and decides to take care of it. As time passes, the garden spreads throughout the dark, gray city, transforming it into a lush, green world.