The paranormal expert, Simon McNeal, is hired to investigate a brutal murder, which seems to be connected to the paranormal. As he delves deeper into the case, he discovers that the victim's bloodied body has strange marks on it, believed to be messages from the dead. His investigation leads him to a house that is a gateway for spirits to travel through, as they make their journey to the afterlife. Simon meets Mary Florescu, who claims to be a clairvoyant and has been obsessed with the house for years. Together, they try to unravel the secrets of the house and the Book of Blood, a collection of supernatural stories that is said to be written in human flesh. As Simon and Mary explore the house, they come face-to-face with the ghosts of the past, who have their own motives and stories to tell. The movie is a horror thriller that takes viewers on a journey through the supernatural realm, with unexpected twists and turns.