The knife slashed one way across her mouth, then the other, silencing her words. The last thought she had as the knife plunged down was that at least it would all be over soon...

When Jennie Killingbeck goes missing while driving back to Albuquerque, Detective Alyssa Wyatt and the squad quickly swing into action to bring her home, alive.

But the case takes a darker turn when FBI Agent Ryker Newlin walks into their precinct. For the past six years, the FBI have been searching for a killer dubbed 'The Sunset Slayer' for their M.O. of brutally murdering young red-haired women, mutilating them with an 'X' across their lips.

The Sunset Slayer has taken lives in multiple states and, upon seeing Jennie's striking red hair on the news reports, Ryker is here to warn the Albuquerque PD that they might have a serial killer operating in their midst.

Finding a murderer in the desert of New Mexico won't be easy, but both Alyssa and Ryker are determined to bring an end to The Sunset Slayer's bloodshed ... before another victim appears.