A cunning serial killer. A victim who appeared to escape. Until now... Nina Guerrera, FBI Special Agent, escaped a serial killer's trap at sixteen. When she is mugged in a Virginia park, a video of the attack goes viral. The legions of new fans aren't the only ones impressed with her fighting skills. The man who kidnapped her eleven years ago is watching her. Determined to reclaim his lost prize, he commits a grisly murder designed to lure the investigator away. His games have only just begun. And, thanks to the internet, everyone can participate. His encrypted codes have turned him into a depraved social media superstar - a cyberghost nicknamed Enigma - but to Nina he's a monster who preys on the most vulnerable. Aided by the FBI's top mind hunter, Nina will follow lead after lead, victim after victim, until she hunts down the killer while the world watches.