Black Sheep opens biblically, with a mining village named Mount of Zeal, which is ‘built in a bowl like an amphitheatre, with the pit winding gear where a stage would be’. It is divided into Lower, Middle and Upper Terrace, the last-mentioned known by the locals as Paradise. If, like many bookshop browsers, you judge a novel by its first page rather than by its cover, you might think, at this early point, that Susan Hill’s fairly recent theological studies sit heavily on the structure.