New York Times best-selling author Gregg Olsen and true-crime journalist Kevin M. Sullivan travel down a bizarre trail of murder into notorious Pennsylvania.

A seemingly normal husband father of two decides to kill young girls after storming an Amish schoolhouse, and sex may have been the prime motivator. A young high school student has a secret desire for murder, and decides a middle of the night visit to his best friend's house will do nicely to satiate his hunger to kill. A seedy individual living in an even seedier part of Philadelphia decides to populate his basement with kidnapped women for sex and the bearing of children, and it is death to those who do not submit.