Here's the teaser blurb from the back:
While the terrified villagers evacuate their doomed town, frantic work continues in the caverns deep beneath their feet in a last ditch attempt to save it.
Marwood Clay, already mistrustful of the mysterious Dr. Temple, meets a man from Temple’s past who finally seems to validate and confirm Clay’s worst suspicions. But even as he learns the awful truth about his nemesis, little does he realise the full horrifying extent of Temple’s masterplan. A plan which, now his strange house is complete, Temple can finally reveal.