When hardened psychiatrist "Martin" (Jordan Belfi) arrives at the prison, he is charged by the warden (Tom Ohmer) with certifying that a prisoner is mentally fit. Mentally fit to be electrocuted, that is! Opposite him, shackled to the table is a man (Sean Patrick Flanery) who proves extremely problematic for the normally ordered and structured analyst. That's not least because he claims to be possessed by the eponymous demon and that he has made enough use of this body and so wants to be killed so he can move on! Preposterous we all think, but this orange-suited man knows things he shouldn't, a... llegiu la resta.