A killer can cite scripture for his purpose--and that is exactly what happens when the small town of Holmfirth receives threatening messages taken from the Book of Exodus. The killer begins inflicting plagues of blood, hail, darkness, and other biblical tragedies that result in death, all so his demands to the police may be met: "Let my people go, so that they may worship me." But who are these worshippers? Why is the Exodus Killer obsessed with a book from the Old Testament? And how are these apocalyptic plagues possible? These are the questions that fifteen-year-old Sean Chorath must ask himself as he becomes the legal ward of his older brother. As a detective for the Holmfirth police, Sean's new guardian forces the two of them into the middle of what can only be described as Hell on Earth.