The vast labyrinth of caverns, passages and subterranean rivers beneath the Peak District are a major tourist attraction. But this summer not all the darkness is underground, and not all the devils are folk legends. Mingling with the holidaymakers is a convicted killer, bent on revenge.
Fourteen years ago Mansell Quinn was sentenced to life imprisonment for stabbing his lover to death. Now he's out and within a matter of hours his ex-wife is found dead
