Painkiller is a nickname of a pretty unusual mercenary, who is dealing with supernatural. There are places on Earth where demons and other evil creatures have their nests: abandoned prisons, private castles, deep caves in the mountains... "Cleaning" those places is good money, and our hero needs a lot of it, since he loves living the life to its fullest. One day he gets what seems to be a pretty simple job: to retrieve a religious artifact from one of the nests. When after a furious battle he realizes he might have been tricked into the war between two competing clans of the undead, he tries to play his own cards.