For the first time ever, Hannah, a little girl from the big city, is spending the summer with her grandfather. As it just so happens, he's the Guardian of an astonishing forest, where trees go for a walk when they get bored, animals can speak, pigs magically regenerate, and 120-year-old gnomes are in the throes of teenage angst... Once she gets over her initial surprise, Hannah is delighted to discover this fantastical place.