The world of Peter Hanson, emerging true crime writer, is about to fall apart. He is informed by the police that both his parents have been found dead in their bed. The case is quickly closed under the claims of natural causes, despite the doubts of Robert Cooper, the homicide investigator in charge of the case. Peter goes through a challenging phase where grief mixes with strange manifestations and hideous nightmares to the point where he starts having doubts about his state of mind: the buzz of flies, the smell of rot and the excruciating laments of grieving souls. Thanks to the support of Jack Sullivan, a former priest specialized in demonic exorcisms, Peter realizes that sanity and logic have very little to do with the events unfolding. A dark force is at play: an ancient and insatiable evil that feeds off negative human emotion is on the hunt for a new prey.