Midian, Tennessee is under siege. Demons prowl the streets and the underworld is rising, bent on consuming every living thing in the town. The only thing that keeps them back is the Watch; a group of citizens that are dedicated to holding the line against the darkness. They've faced every kind of physical threat imaginable and come out victorious. But when a new demon blows into town with the power to possess, the Watch finds itself facing something they've never dealt with before...one that will test them all to their very limits...and one which not all of them will survive...