Fourteen years ago, prosecutor Jessica Yardley's husband went to prison for a series of brutal murders. She's finally created a life with her daughter and is a well-respected attorney. She's moving on. But when a new rash of homicides has her ex-husband, Eddie, written all over them - the nightmares of her past come back to life.

This is Reaper speaking. So begins an anonymous letter published in a Utah newspaper after a young couple is viciously murdered. Tooele County sheriff Elizabeth Gray leads the investigation into the double homicide, which is eerily reminiscent of a string of brutal killings years ago. When the letter leads detectives to yet another body, Gray calls on an old friend for help.

A serial murderer nicknamed the Blood Dahlia has been terrorizing the quiet suburbs of Pennsylvania. Brutally mutilating his victims in the fashion of the most famous murder in Hollywood, the killer leaves no trace behind. The FBI's elite Behavioral Science Unit, the section responsible for the study and investigation of serial murder, has little evidence on which to go, until they meet Sarah King. Sarah, a mysterious outcast of the Pennsylvania Amish community, claims she has a unique ability: She can speak to the dead. And the victims of the Blood Dahlia are calling out to her.

The Cheyenne Police Department doesn't handle many murders. So when a woman is found mutilated and crucified, detective Kyle Dixon catches a case where all the evidence has long since been destroyed. Any detective would find it a difficult investigation, but to make matters worse, Dixon is paired with Ethan Baudin: a new detective in the unit who doesn't believe the law should apply to those that chase monsters. They find that the murder is connected to a rash of fraternity rapes and the case becomes highly publicized and politically charged.

Alex Armstrong has changed everything about herself—her name, her appearance, her backstory. She’s no longer the terrified teenager a rapt audience saw on television, emerging in handcuffs from the quiet suburban home the night her family was massacred. That girl, Alexandra Quinlan, nicknamed Empty Eyes, was accused of the killings, fought to clear her name, and later took the stand during her highly publicized defamation lawsuit that captured the attention of the nation. It’s been ten years since, and Alex hasn’t stopped searching for answers about the night her family was killed.