I only recently discovered Phil Rickman accidently while leafing through a used book shop. I'm hooked!!
I think this is the first book that he wrote and it shows in that it's not quite as polished as the others and doesn't really have a satisfactory climax as lots of questions are left unanswered. However, don't let that put you off. Superbly written, subtle and understated, definitely for those who prefer their horror more psychological than in your face gore.
I go to Wales on holiday quite regularly, living just the other side of the Severn Bridge as I do, but I'll definitely be looking beneath that Welsh Welcome from now on!