Strange Blood, Lindsay Ashford

Investigative psychologist, Megan Rhys, is called in to help the police with the murder of a young mother who has been brutally killed and a pentagram carved in her forehead. While the media-obsessed police chief wants to call it a satanic ritual, Megan keeps an open mind and starts investigating the details of the victim's life - and the lives of the other victims as the murders increase. But then Megan makes a dangerous mistake herself...