A monster lurks in the house next to the ancient ruins of Cumae where, in 427 BC, a young girl was chosen by the gods to become the Sibyl--oracle of the Greco-Roman people that enhabited the area. Though she lived to fulfill her mission, it is written that the chain of oracles, passing from one young girl to another, will continue forever. Now, American author David Jeffrey is killed along with his teenage daughter, Angelica, when a fire breaks out in their Naples, Italy, home. When David's brother, Jake, decides to leave Michigan with his family to visit his brother's widow, Jennifer, strange things begin to happen in the modeled, castle-like home near the ancient ruins of Cumae.