Fourth Estate (Double Blind #4)
Dan Alatorre

And anyone they trashed could be a suspect.
Detectives Carly Sanderson and Sergio Martin hunt for the serial killer while simultaneously being saddled with an image consultant hired to improve the police department’s profile.
When the killer announces his intention to widen his range of victims, public pressure to find him goes through the roof. But internal office politics hamstring the investigation, forcing Carly and Sergio to work around the clock - and around the rules - to uncover the secret connections the victims shared with their killer.