Is evil a metaphor for the bad things people do or does it prowl the earth like a living, breathing entity that possesses the souls of vulnerable humans? Author Ron Felber joins Richard Syrett (Twitter) to discuss what some are calling the most frightening book about demonic possession since "The Exorcist"- his new novel "The Unwelcomed." Felber will talk about his research into demons and possession, and how his understanding of the phenomenon changed him. Followed by Open Lines in the latter half.