The Second Sleep, Robert Harris

Dusk is gathering as a young priest, Christopher Fairfax, rides across a silent land.

He must arrive at a remote village in the wilds of Exmoor before night falls. He's lost and he's becoming anxious as he slowly picks his way across a countryside strewn with the ancient artefacts of a civilisation that seems to have ended in cataclysm. What Fairfax cannot know is that, in the days and weeks to come, everything he believes in will be tested as he uncovers a secret that is as dangerous as it is terrifying .