Cameron Caldwell's life is forever changed. After catching the HomeTech Hub killer and losing her dream job, she's determined to get her life back on track. Her new consulting business is rough going, but she's focused on success... and staying far away from any business involving the police. But when she meets a mysterious man who might not be what he appears, there's only one person she can call for help.

Detective Will Justus's world keeps changing. There's a new kind of criminal on the loose, one who doesn't even need to be at the crime scene to commit murder. Backed into a corner and needing a specific kind of technical help, he decides to reach out to an old friend. Regardless of their rocky relationship, Cameron Caldwell might be the only one who can put the pieces together.

Together, they begin the hunt for a new kind of killer.