A famous American book collector is found dead, at the bottom of Herlesdem Scar on the lonley Yorshire moors, his body a mass of battered flesh. Was it just a terrible accident, as all evidences seem to suggest? His nephiew and captain Mannering think not - they understand that a sinister and mysterious murder has just taken place when they realise that the acquisition, by the victim, of a certain neglected volume, had some strange bearing on his death. And a breathtaking chase begins... J. S. Fletcher weaves the storylines of this riveting mystery with great dexeterity - a true page-turner.