Hell Spawn - Saint Tommy, NYPD

My name is Officer Thomas Nolan, and I am a saint.

I can smell evil. I show mercy to the lesser criminals - the desperate. Even those I've put behind bars seem to like me. But now there's a serial killer bringing darkness beyond imagination to my city. I can smell his stench a mile away. But how can I prove it?

How do you do forensics on a killer possessed by a demon?

From Declan Finn, author of the Dragon Award nominated horror series Love at First Bite.