New York Homicide detective Becky Haden saw professional killer Ariella Blumkin killed in Costa Rica but she had her doubts as to whether the woman was really dead. A grisly sex murder in Spanish Harlem confirms that the woman is still alive and still taking lives. Haden works with FBI Agent Marcie Quinn to set an elaborate trap to snare Ariella and send her to prison. Unaware of the trap, Ariella makes hits in Puerto Rico and Honduras before returning to the United States and the waiting authorities set on arresting her. Meanwhile Russian hackers are devastating American infrastructure by infiltrating fuel supplies, hospitals and the electrical grid. The CIA is desperate to find a way to end the hacking and send a message to the Russian authorities behind it.