Roland, Helen, Nicholas and David, four Manchester children, are led into Elidor, a twilight world almost destroyed by fear and darkness.

On a gloomy day in Manchester, Roland, Helen, Nicholas and David are lured into a ruined church, where the fabric of time and place is weak enough to allow them into the twilight world of Elidor. It is a place almost destroyed by fear and darkness, and the children are charged with guarding its Treasures while a way is sought to save the dying land.

Then the evil forces find a path through to this world…