Teeth of Gods — Adrienne Jones

Old adversaries are forced into an alliance in this sequel to 'The Hoax', when an otherworldly assassin begins murdering former members of the Forest Bluffs cult. When conventional weapons have no effect on the unearthly killer, Agent Litner knows he has only one choice: To find Shep, his greatest and most frightening enemy, and ask for his help. While reluctant, Shep aligns with the agent when it becomes clear that the assassin's ultimate goal is to destroy all he holds dear. Two worlds conspire and collide when the real truth about the assassin's mission is revealed, and they face a shocking new foe that throws their existence into chaos.