The Demonologist follows Detective Damien Seryph as he investigates a series of brutal murders that bear a connection to a dangerous cult attempting to summon the four King Demons of Hell. As he delves deeper into the case, Damien realizes that his past is intertwined with the cult's activities and that he must confront his own demons in order to stop them.
With the help of a psychic medium named Darcy, Damien uncovers a sinister plot to unleash powerful demons into the world and must race against time to prevent it from happening. Along the way, he must confront his own traumatic memories and come to terms with his role as "The Demonologist" - a title bestowed upon him by the cult as their chosen adversary.
As the stakes get higher and the body count rises, Damien must navigate a dangerous maze of supernatural threats and human conspiracies. With the fate of the world at stake, he must summon all of his courage and expertise to stop the cult before it's too late.