The presence of a stranger, however innocent his purpose, in the small Welsh town of Knighton is bound to arouse curiosity - even suspicion. Especially in the light of the strange, inexplicable events currently plaguing the peaceful community. Police Sergeant John Mayo has come to Knighton to seek sanctuary: to try and come to terms with the tragic death of the woman he loved. But his arrival coincides with the murder - in their blazing cottage - of an English property developer and his girlfriend. At first the terrorist tactics of Welsh nationalism are blamed, but when a local drug pusher is viciously attacked, his throat torn and savaged, the finger of accusation begins to point firmly in Mayo's direction. Mayo alone knows that he is not responsible for the anarchy that has gripped Knighton, for the horror that begins only after dark. And as horrific murders follow assaults of inhuman ferocity, a dead woman is glimpsed wandering the streets, and the ancient legend of the Knighton Vampires is resurrected once more, Mayo must act to save its inhabitants from a horror beyond their wildest imagininings. Will his presence herald the final destruction of Knighton - or its salvation?