Evil that Men Do by Hector Medina

Evil that Men Do begins with the first book, Heathens, and follows two demon hunters, Apollo and Dion as they travel through the city of Havenbrook. Their mission is simple, to deal with or kill the leader of a cult bent on bringing to life a hellspawn.

However, with confliction philosophies and attitudes they'll have to solve a lot of their man-made problems. Worse, the cult leader they're hounding for might not be the worst the city has to offer.