Special agent Sarah Reilly is the daughter of an FBI legend. Her father made his reputation hunting down one of America's worst serial killers. Now it's her turn.

A monster is cruising the east coast. One who has stalked the United States for three decades, claiming countless victims. A chameleon who has found a fatal flaw in the forensic profiler's art.

At the same time, someone is hunting down and eliminating serial killers with mechanical precision. A hunter with uncanny skill, limitless resources and lethal determination.

With the serial killer's interest in Sarah growing, and the hunter drawing closer to his ultimate prey, time is running out. To save what is most precious to her, Sarah will have to enter the maelstrom or face her darkest fears.

Special Agent Sarah Reilly has just been decorated for bringing down one of America's worst serial killers. Refusing extended leave, she goes straight back to work in the Boston field office. But the murder of a child, Milo Kane, sees her transferred to LA to head up the FBI's investigating task force.

Within weeks, public sympathy for Milo's parents splinters into suspicion, and the LA District Attorney rides the wave against them. Sarah suspects that the parents are withholding something and when she discovers their former bodyguard is missing, she inches closer to finding answers.

Dealing with the media pressure, the politics and the emotional aftershock of her last case, Sarah knows that bringing the killer to justice won't be simple. But even she isn't prepared for the evil she will find.