Escape

Chicago’s #1 detective, Billy Harney, takes on a billionaire crime boss in this follow-on to James Patterson’s highly acclaimed, multi-million selling Black Book.
As Chicago’s special-ops leader Detective Billy Harney knows well, money is not the only valuable currency. The billionaire he’s investigating is down to his last twenty million. But he’s also being held in jail.
For now.
Billy’s unit is called to the jail when six inmates escape, and two others are missing. Two correctional officers are dead. Approaching the scene, Billy spots something in an empty lot.
Two Kevlar vests.  Two helmets.  Two assault rifles. And a handwritten note:
Hi, Billy
Are you having fun yet?
"The ALPR sounds on the dashboard of our unmarked car, registering every license plate we pass, searching for any plate beginning with the letters F and D. But our witness told us the letters might have appeared the other way around, D and F, and maybe not even next to each other. If we have this right, the same man who kidnapped Bridget Leone has abducted four other girls between the ages of thirteen and sixteen, all African American, around the Chicagoland area over the last eighteen months. None of those four girls has been found. All four of them were runaways, homeless meaning they were easily overlooked and forgotten by overworked and understaffed suburban police departments dealing with cold trails of girls gone missing."