Shane is the original Demon Hunter but then there are nine levels of Hell

Hotter than Hell - Paranormal Romance 

If I warned you that the fire was going to burn you - Would you still touch the flames? 

HELL - A place that everyone has heard of but where nobody wants to go.
But what do you do when Hell comes looking for you?

This is the first book in the series of Demon Hunters by Melissa Bell & J. Thiele.