Sophie Anderson takes a week off to visit colleague and friend, Detective Darren Carter, in Tucson Arizona. But she's not in Arizona for ten minutes before murder interrupts their well-laid plans - and her visions suddenly return for the first time in six months.
Sophie and Darren investigate the murder, and a week later the killer strikes again - there's a serial killer in Tucson. The pair follows leads to Chicago and Las Vegas, trying to find out what the victims had in common and why the killer targeted them.
Meanwhile, Sophie's visions of a woman's horrific death haunt her and she pushes herself harder in an attempt to save the woman she suspects may be the next victim.
With time running out, a startling discovery is made - one that changes everything and redefines cybercrime.