A kid named Roscoe draws disturbing pictures of a demon and hangs them on his bedroom walls. One night the demon pays him a visit. The next day he tells his mother about it and she thinks it's just his over-active imagination. The next night the demon reappears, incinerates the parents in their bed, and leads the boy out into the nearby woods. There, he directs the child to crawl into a red, glowing, smoking hole, which leads to another dimension. He does.
Years later, a skinny, Rip Van Winkle-like man emerges from that same hole. It's Roscoe. He goes back to his house and different people are living there, so he finds refuge in an abandoned house and sleeps. But other demons have followed him out and they start killing people. One creature encounters some construction workers--and transforms one of the men into a hideous horned monstrosity to do its bidding. It kills the other workers. Another demon makes a group of campers kill one another and a different one resurrects corpses from the graveyard. These zombies attack the home of a girl that Roscoe used to be childhood friends with and they dismember her father. She gets away in her car and almost runs over Roscoe. She asks what happened to him all those years and he shows her, telepathically, how he was taken by Deimos and taught the dark arts. The demons says he is a guardian of the universe. But it's when some of the demon's energy is transferred to Roscoe that he remembers his old human life. He sees the death of his parents and is furious. He rebels and unwittingly frees evil demons who are imprisoned in these stone vessels. These are the monsters who are killing everyone. The girl is pissed at him, he apologizes and they stick together to stop the evil. People are possessed, others are slain, and Roscoe has a showdown with the demons.
THE DEMON'S ROOK feels--and looks--like a horror movie from the early 80's, like SEE NO EVIL or even THE DEVIL'S RAIN. The practical latex makeup effects are over-the-top and suitably gory. Recommended.