Four years ago Ellen Vicksburg went missing in River Remez, New Mexico. Her younger brother, Ben, found her body in a shallow grave by the river's edge on the first anniversary of her death. Now he's committed to finding her murderer; police believe she was the victim of a psychopath known as the Demon. In the police files, Ben's analytical mind sees patterns that don't fit, and he compares them to similar unsolved murders. As the body count rises, a picture emerges of an adversary who is as cunning and methodical as he is twisted.