Emmet is the Arsonist due to how the story describes him as having been a scary farmer but it also makes no referance to a fire (as shown in the arsonist's portrait), this being considered it is possible that it could be the Ogre (Rasputin) as the horrifying description somewhat fits....
but I suggested that they might need an exterminator rather than an exorcist–from their description, the noises were probably caused by an infestation of death-watch beetles. On the other hand, poltergeist infestations are also well-known for ...