The Face of Time — Camille Bacon-Smith

Tracking down a serial killer in the town of Thorgill, two New Scotland Yard officers are about to enter a whole new territory of police investigation. And though one of the detectives and the townspeople know what is really going on, no one's willing to let his partner in on the secret. But as ancient rituals begin to be fulfilled, the two officers find themselves drawn into an unholy war--facing an enemy more powerful than death itself.