Hey, Vance. It's a novel, Christian based, that goes into the "dark" side, like evil, satan, etc. The paranormal I guess, but in the end Christianity reigns. God triumphs over evil. In this case, Adam, the hero is confronted with a serial killer who believes he is satan, or working under satan's influence. It's never certain whether he really is or isn't, or if he's just mentally ill. Strange things happen in the book that make you wonder how they could have happened.
It's the proverbial good against evil. Kind of like Harry Potter or Lord of the Rings, only set in mostly modern times.
For instance Adam reads as fast and as riveting as any of Steven Spielberg's books, minus the bad language. And you don't even notice it's missing. And in the end, there's a Christian moral of some sort. Hope this helps.