Rumours and mistrust abound around an old pastor. Five boys: Tom, Andy, Roger, Jack and Ed are intrigued by him and one boy goads the others on to explore the pastor's house as part of a dare. However, the pastor returns and, in their haste, the boys rush into the basement and through a door which leads them into another, mystical, world. Here they encounter strange, mythical creatures. They also meet a mysterious man called Mister Gravoa and are told that they have a debt to pay. They are separated and begin their life changing experiences. But how do they pay their debts and will they ever be able to get back home again?