In Dark eye Susan Pulaski teamed up with Darcy O'Bannon, an autistic genius, to solve a series of gruesome crimes. Now, Darcy is acting as an unofficial consultant to Pulaski's work with the Las Vegas Police Department as a police behavioralist, and once again Pulaski needs his mind to track a serial murderer with a cryptic modus operandi. The killer views himself as an angel of vengeance, punishing others for the crimes of his own childhood, and he selects his victims through a mysterious numerology. In order to understand the killer, Pulaski needs Darcy's help more than ever, but his father, a detective with the LVPD, opposes his involvement. Now Pulaski must fight against an increasingly hostile police department as the body count rises. Las Vegas police behavioralist Susan Pulaski races to stop a serial killer who uses a mysterious numerology to select his victims in this chilling sequel to Dark eye.