Tree and Beast

It seems like Hunter will never have an exciting adventure like the ones in the books he's always reading. That is, until he finds a hollow tree behind his school full of tiny people, and crawls through it into a humming, glowing forest. He meets a story-telling raven who's much more than he seems, and almost gets eaten by a giant dog-monster. Then he discovers the forest is under attack, and he'll have to stand up and fight if he doesn't want to lose the dream world he's only just found.