When David is old enough to realize that, while not visibly abnormal, mentally he - and others - are different, more than human, he is terrified of discovery. He lives in a land threatened by the twisted mutants of the cursed Fringes, a land where genetic conformity is the Will of God, and any deviation, from a minor quirk to a body-warping distortion, marks the sufferer as non-human, to be cruelly abused and ruthlessly cast out.

If their ability to communicate using thought alone is found out, David and his friends would be in terrible danger. They would have to run - but where to? And who is this new, distant thought-voice they can hear? Could it be from the impossible glittering cities that David has dreamt of, places from the past, from before God sent his terrible earth-scorching destruction to punish the wicked? And might it hold the key to their freedom...