Natural Causes

This is the first in the Detective Inspector McLean series of crime novels by author James Oswald. His previous genre specialties were comic books, fantasy and science fiction, so perhaps it is not surprising that there is an element of the supernatural is this police procedural. Not quite sure what led me to this author, but I had also recently dipped into another crime novel series (Inspector Rebus) by a Scottish author, and they have both been grim and somewhat grisly--giving the Scandinavians a run for their money on that score.
McLean has just recently been promoted from sargeant to inspector, but that does not mean he can avoid dealing with an odious and incompetent superior--Chief Inspector Daguid. When McLean happens upon an active crime scene while visiting his grandmother's house, he can't help but check in to see what's going on, and Daguid immediately yells at him for interfering and then gives him tasks to do. The body has been found in an elegant old house, long abandoned, and now slated for conversion to luxury apartments. The developer has found a horribly mutilated and mummified body in the basement, apparently a young girl who was the victim of a macabre ritual involving removal of her organs. Only McLean seems to notice the strange lines drawn around the perimeter of the room. A series of wealthy men begin to die in similarly grisly fashion--cut open with organs removed. The perpetrators seem to be random killers--a homeless immigrant, a secretary at a bank, a train engineer. It all makes no sense. Unless of course you realize that a demon is at work, now freed from the circle of containment that held him in the dead girl's body.
On a more worldly plane, McLean's grandmother--the woman who raised him after his parents died in an airplane crash when he was 4 years old--has been in a coma for 18 months following a massive stroke; she has just now passed away, leaving McLean suddenly a rich man.
In addition to the tragedy of his parents, the love of McLean's life died  10 years ago in an accident and he has withdrawn from any possibility of romantic involvements--until now. Two women are suddenly in his life, one who is a work colleague of sorts (SOC photographer) and one whose daughter becomes the next potential victim of an aged killer desperate to save his own soul and life.