It’s Halloween night in Cedar Valley. During the town’s annual festival, Detective Gemma Monroe takes a break from trick or treating with her family to visit an old family friend, retired Judge Caleb Montgomery, at his law office. To Gemma’s surprise, Caleb seems worried – haunted, even – and confides in her that he’s been receiving anonymous threats. Shortly after, as Gemma strolls back to her car, an explosion at Caleb’s office shatters the night.