Zak and the crew are in San Francisco investigating a mysterious castle built on top of sacred caverns said to be a haunted by a female apparition. The current owners claim to be plagued by paranormal activity in almost every corner of the property.

Zak and the crew investigate the Pasadena, California, home of a self-proclaimed Satanist. A seance conducted inside the historic Victorian house reveals an inhuman presence has attached itself to Aaron and is trying to communicate with him.