Book 104 Curfew by Phil Rickman
Crybbe is a town on the English-Welsh border which has, in its time, been part of both countries. The people there do not like outsiders, keep themselves very much to themselves, and stay off the streets each night as the curfew bell is tolled, as it has been for four hundred years. Into the town comes radio reporter Fay Morrison, who has come to look after her father, an elderly priest starting to succumb to dementia, and Max Goff, a millionaire music tycoon with an overpowering interest in the supernatural. Max wants to make Crybbe into an international centre for New Age spirituality. The locals, however, just want him to go away. And no one says anything about the town's history of dark magic, or the evil that Max's interest in earth magic is about to unleash.
While this counts as one of Rickman's stand alone novels, chronologically it fits in between Candlenight and The Chalice, with characters from both of them and from the Merrily Watkins series putting in an appearance. It starts out with a very creepy atmosphere and gets progressively more so.