What do you do if you have a termite infestation? Call the exterminator, of course. Now, what do you do if, instead of termites, you have ghosts, vampires, demons, etc.? You call the paranormal exterminators. Kate and Alexander are two such exterminators. It’s not easy dealing with bizarre and terrifying monstrosities on a regular basis, but somebody’s got to do it - even if those somebodies are a human of questionable mental stability and a long-suffering robot.