When Peter comes to live with his aunt and uncle at the shop on Peculiar Hill, he has a lot to learn. What are bogeys and heeble-greebs and the other fierce creatures which live in the nearby Vale of Strange? Why is it so important to wear a hat and sturdy boots? And what is this stuff called strangeness which comes bubbling out of the ground? When Peter discovers the dark secret which lurks at the heart of this place, he finds his efforts to make things better do not go according to plan. He sets out to make amends with the aid of his new friend Amanda, but how can he know that requesting her help will prove to be such a very big mistake?