Edge of Night — Cynthia Danielewski

When a murder victim's body is discovered on the grounds of a local cemetery, NY Police Detective Jack Reeves embarks on an eerie investigation that hints at witchcraft. Needing assistance as he delves into unfamiliar waters, he reluctantly turns to his new wife, Ashley, a reporter who had done in-depth research on Wicca--the witchcraft society linked to the murder.

As Ashley offers him the benefit of her investigation, Jack realizes that her involvement with the craft is much deeper than he thought, and that she may hold the key to solving the case.